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Vendor:UnderGround Treasures
Wulfenite
A beautiful piece featuring several gemmy tabular crystals of orange Wulfenite with clear to white Calcite in and on a vug in brown matrix. Superb color, contrast and crystal formation! In excellent condition. Location: San Carlos Mine, Mun. de Manuel Benavides, Chihuahua, Mexico Size: 10.5 x...- $425.00
- $425.00
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Vendor:UnderGround Treasures
Selenite "Flower"
A beautiful specimen featuring two pristine, lustrous, golden Selenite “petals” on a cluster of darker, smaller Selenite crystals. One of the petals is exceptionally large while the matrix is smaller, letting the Selenite easily become the focal point of the piece. A very aesthetic...- $225.00
- $225.00
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Vendor:UnderGround Treasures
Opal, Natural
A stunning natural Opal (some matrix is still attached) from Welo, Ethiopia. Again, this is its natural form, unpolished. To be honest with you, I prefer this natural Opal over the polished version. (Although, I wisely wouldn’t consider giving this to my wife on...- $800.00
- $800.00
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Vendor:UnderGround Treasures
Labradorite (Spectrolite)
A Feldspar mineral, also known as Spectrolite, or more descriptively, rainbow Spectrolite. Labradorite is named for Labrador, where it was first discovered (imagine that). Labradorite displays an iridescent effect known as labradorescence (once again, imagine that . . . ). When held at various...- $90.00
- $90.00
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Vendor:UnderGround Treasures
Wulfenite
A striking and beautiful example of “sandwich Wulfenite” on a dark matrix from the famous Ojuela Mine in Mexico. These zoned Wulfenite tabular crystals create the unique “sandwich” look, and that, along with their color, luster and balance, makes this an amazing piece! In...- $450.00
- $450.00
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Vendor:UnderGround Treasures
Cassiterite
This cabinet sized piece features a dense coating of black, lustrous, sharp Cassiterite crystals on a rust-colored matrix from the famous Viloco Mine in Bolivia. The Cassiterite crystals are large, very sharp and mirror-like and contrast amazingly with the matrix. A very aesthetic piece...- $95.00
- $95.00
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Vendor:UnderGround Treasures
Epidote
A lustrous dark-green cluster of Epidote crystals with striations and wedge-shaped terminations on a matrix of crystallized massive Epidote. Under lighting, the classic pistachio-green can be clearly seen. A very aesthetic specimen of Epidote in excellent condition. Location: Pampa Blanca, Castrovirreyna District, Huancavelica Department, Peru...- $135.00
- $135.00
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Vendor:UnderGround Treasures
Vanadinite
A large specimen of deep-red Vanadinite crystals on black Goethite matrix. The crystals are large, sharp, lustrous and translucent and contrast nicely with the dark Goethite matrix. Very aesthetic piece in excellent condition. Location: Mibladen, Midelt, Morocco Size: 18 x 9 x 11 cm- $225.00
- $225.00
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Vendor:UnderGround Treasures
Hemimorphite
Large plate of turquoise blue botryoidal Hemimorphite - great color with a nice silky luster - beautiful piece! Location: Yunan Province, China Size: 12 x 9.5 x 5 cm- $415.00
- $415.00
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Vendor:UnderGround Treasures
Aragonite Stalactite
A large stalactitic formation of translucent, lustrous white, cave Aragonite. A very aesthetic piece with countless delicate branching crystals throughout. Great luster, crystal formation and size. In excellent condition. Location: Chihuahua, Mexico Size: 13.5 x 9 x 12.5 cm- $140.00
- $140.00
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Vendor:UnderGround Treasures
Celestine Geode
A large double geode filled with gemmy, transparent sky-blue Celestine crystals. The crystals are all in pristine condition, exceptionally large and with no damage. I was able to pick through literally hundreds of Celestine Geodes in order to find a few that were exceptional...- $290.00
- $290.00
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Vendor:UnderGround Treasures
Astrophyllite
This large piece hosts numerous sprays of radiating, bronze-colored Astrophyllite crystals with metallic-like luster on matrix. Great symmetry and luster. Unique and aesthetic piece in excellent condition. Location: Eveslogchorr Mt., Khibiny Massif, Kola Peninsula, Russia Size: 9.5 x 3.7 x 8.5 cm- $165.00
- $165.00
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Vendor:UnderGround Treasures
Epidote
A superb, lustrous spray of dark olive-green Epidote crystals. A beautiful and classic formation in excellent condition. Location: Pampa Blanca, Castrovirreyna District, Huancavelica Department, Peru Size: 7.8 x 5 x 2 cm- $185.00
- $185.00
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Vendor:UnderGround Treasures
Pink Opal
From a relatively new discovery in Peru - this beautiful, all natural pink Opal has a botryoidal-like form, with a soft, satiny luster. It is gem quality and hard to find - a striking piece with great color and luster. In excellent condition. Location: Pisco...- $130.00
- $130.00
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Vendor:UnderGround Treasures
Rhodochrosite
Several nodular aggregates of sparkling, bright pink crystalline Rhodochrosite set on a dark-gray/black matrix. In one instance there is a stack of interconnected nodules. A very unique piece with great luster, color and contrast. In excellent condition. Location: N'Chwaning Mines, Kuruman, Northern Cape, South Africa...- $140.00
- $140.00
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There are 126 Page(s) and article(s) for 'mixed-minerals*'
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Wulfenite
A beautiful piece featuring several gemmy tabular crystals of orange Wulfenite with clear to white Calcite in and on a vug...View product -
Selenite "Flower"
A beautiful specimen featuring two pristine, lustrous, golden Selenite “petals” on a cluster of darker, smaller Selenite crystals. One of the...View product -
Opal, Natural
A stunning natural Opal (some matrix is still attached) from Welo, Ethiopia. Again, this is its natural form, unpolished. To be...View product -
Labradorite (Spectrolite)
A Feldspar mineral, also known as Spectrolite, or more descriptively, rainbow Spectrolite. Labradorite is named for Labrador, where it was first...View product -
Wulfenite
A striking and beautiful example of “sandwich Wulfenite” on a dark matrix from the famous Ojuela Mine in Mexico. These zoned...View product -
Cassiterite
This cabinet sized piece features a dense coating of black, lustrous, sharp Cassiterite crystals on a rust-colored matrix from the famous...View product -
Epidote
A lustrous dark-green cluster of Epidote crystals with striations and wedge-shaped terminations on a matrix of crystallized massive Epidote. Under lighting,...View product -
Vanadinite
A large specimen of deep-red Vanadinite crystals on black Goethite matrix. The crystals are large, sharp, lustrous and translucent and contrast...View product -
Hemimorphite
Large plate of turquoise blue botryoidal Hemimorphite - great color with a nice silky luster - beautiful piece! Location: Yunan Province, China...View product -
Aragonite Stalactite
A large stalactitic formation of translucent, lustrous white, cave Aragonite. A very aesthetic piece with countless delicate branching crystals throughout. Great...View product -
Celestine Geode
A large double geode filled with gemmy, transparent sky-blue Celestine crystals. The crystals are all in pristine condition, exceptionally large and...View product -
Astrophyllite
This large piece hosts numerous sprays of radiating, bronze-colored Astrophyllite crystals with metallic-like luster on matrix. Great symmetry and luster. Unique and...View product -
Epidote
A superb, lustrous spray of dark olive-green Epidote crystals. A beautiful and classic formation in excellent condition. Location: Pampa Blanca, Castrovirreyna District,...View product -
Pink Opal
From a relatively new discovery in Peru - this beautiful, all natural pink Opal has a botryoidal-like form, with a soft,...View product -
Rhodochrosite
Several nodular aggregates of sparkling, bright pink crystalline Rhodochrosite set on a dark-gray/black matrix. In one instance there is a stack...View product -
Labradorite
A Feldspar mineral, also known as Spectrolite, or more descriptively, rainbow Spectrolite. Labradorite is named for Labrador, where it was first...View product -
Vanadinite
This is a huge, incredible plate of Vanadinite. I have not seen a larger nor nicer specimen. The hexagonal crystals are...View product -
Rhodochrosite
Sparkling layer of rounded, bright pink Rhodochrosite crystal aggregates completely covering the dark-gray/black matrix. The luster, color and contrast is just...View product -
Scheelite
A very large, highly translucent, pristine crystal of golden Scheelite. This large octahedral crystal sits on a matrix of lustrous silvery...View product -
Vanadinite on Barite
A large specimen featuring lustrous, reddish-orange, tabular hexagonal Vanadinite crystals coating numerous clusters of bladed white Barite crystals, all on a...View product -
Aragonite, Blue
An extremely aesthetic specimen of botryoidal sky-blue Aragonite with needle-like (acicular) crystals throughout on dark-brown matrix. The unique sky-blue color is...View product -
Dioptase
A cabinet-sized specimen of matrix hosting a perfectly centered dense cluster of lustrous, translucent, rich-green Dioptase crystals. Truly a beautiful mineral,...View product -
Brucite
Brucite is an uncommon mineral, up to now found only in a handful of deposits around the world and relegated to...View product -
Vivianite
A beautiful specimen featuring two complete parallel, green, translucent Vivianite crystals on a contrasting brown Limonite matrix. The crystals are tabular with...View product -
Pyromorphite
Translucent apple-green crystals of Pyromorphite cover this piece on all sides, with a particularly rich and dense cluster of Pyromorphite perfectly...View product -
Garnet, Spessartine on Albite
Garnets are found in metamorphic rocks, and this particular piece hosts a large and striking Garnet crystal with large and well-defined...View product -
Blue Aragonite
An extremely aesthetic specimen of botryoidal sky-blue Aragonite with needle-like (acicular) crystals throughout on dark-brown matrix. The unique sky-blue color is...View product -
Pyromorphite
A superb specimen of lustrous, apple-green hexagonal Pyromorphite crystals with flat terminations on a contrasting Limonite. Pyromorphite crystals this large (over...View product -
Magnetite
A large, superb specimen featuring numerous, dark-gray, sharp octahedral Magnetite crystals in a contrasting matrix. There are a half-dozen large, well-formed...View product -
Lepidolite, Bi-Color
This is a very fascinating form of Lepidolite - the outside perimeter of the crystal is more-or-less lavender while the inside...View product -
Glendonite
This is a very unique specimen: A spherical cluster of brown Calcite crystals pseudomorphed after Ikaite. The Calcite chemically replaced the...View product -
Pyromorphite
This is a large, beautiful and striking piece that features a vuggy Quartz matrix hosting numerous clusters of translucent, lustrous apple-green...View product -
Rhodochrosite with Quartz, Calcite
A very aesthetic and colorful specimen featuring sparkling, translucent pink crystallized Rhodochrosite over translucent, clear to white microcrystalline Quartz on matrix....View product -
Blue-Green Aragonite
Aragonite comes in many forms and colors, one of the most common being the radiating clusters of translucent red-brown pseudo-hexagonal clusters....View product -
Lazurite
A perfectly centered single crystal of indigo-blue Lazurite, a highly sought after gemstone, in contrasting white marble. The Lazurite with its...View product -
Hubnerite, Quartz and Chalcopyrite
This specimen features both a larger and smaller cluster of jet-black, lustrous Hubnerite crystals, both centered on a plate of highly...View product -
Opal, Boulder
A large, iridescent and translucent vein of gemmy opal running through brown sandstone. What an eye-catcher! Location: Maynside/Opalton, Queensland, Australia Size: 6.5 x...View product -
Brucite
Brucite is an uncommon mineral, up to now found only in a handful of deposits around the world and relegated to...View product -
Aegirine with Microcline
An uncommon specimen featuring intersecting crystals of buff-colored Microcline hosting dense clusters of thin, lustrous, deep-green Aegirine crystals. A unique and...View product -
Brochantite
A striking piece featuring deep-green, highly translucent, acicular Brochantite crystals on a dark-brown matrix from Tsumeb. At first glance it can...View product -
Vivianite
A lustrous, fan-shaped cluster of elongated, translucent, dark-green Vivianite crystals on matrix coated with contrasting velvety-black Goethite. An exceptional specimen with...View product -
Vivianite
A large, lustrous, fan-shaped cluster of elongated, translucent, dark-green Vivianite crystals on matrix coated with contrasting velvety-black Goethite. An exceptional specimen...View product -
Zircon
This cabinet sized specimen hosts a single, sharp, translucent deep-red Zircon crystal exhibiting the class pyramidal termination often associated with this...View product -
Epidote
This is a massive cluster of countless intersecting, doubly-terminated prismatic Epidote crystals (ok, maybe not countless, but way more than I...View product -
Opal, Boulder
A large, iridescent and translucent vein of gemmy opal running through brown sandstone. What an eye-catcher! Location: Maynside/Opalton, Queensland, Australia Size: 6.5 x...View product -
Amazonite
A exceptionally large, single crystal of Amazonite, a variety of Microcline. The crystal is complete all around including a clean termination,...View product -
Rhodochrosite on Quartz
A cluster of translucent white Quartz crystals hosting platy (lenticular), pink translucent Rhodochrosite crystals. The large, focal Rhodochrosite crystal is perfectly...View product -
Boulder Opal
An unusually large piece of Boulder Opal with an impressive seam of Opal running through it, with multiple smaller seams throughout...View product -
Opal, Boulder
A large, iridescent and translucent vein of gemmy opal running through brown sandstone. The purple-hued opal in the center of the...View product -
Mimetite with Calcite
A very colorful and large piece featuring deep-yellow/golden botryoidal Mimetite crystals on a red-brown matrix, partially coated with transparent Calcite rhombohedrons....View product


































