Checkout

0 item @ $0.00

Home | My Cart | Login | Register

Recently Released New Additions

Hide Solds

Rare Minerals

Saturday, 31 May 2025 06:00 PM

Introducing the "Rare Minerals" gallery which is part of our New Additions galleries. This gallery contains mineral specimens for sale including fedotovite, fluorite, gauthierite, giuseppettite, hypercinnabar, and iodargyrite and more from places like Tolbachik Volcano, Kamchatka, Russia, Denton mine, Hardin Co., Illinois, United States, Shinkolobwe, Katanga, Democratic Republic of Congo, Sacrofano, Roma, Lazio, Italy, Mount Diablo mine, Contra Costa Co., California, United States, and Bisbee, Cochise Co., Arizona, United States.

SOLD

Fedotovite - 65951

Fedotovite - 65951

Fedotovite

#65951

Details
Data
Provenance
Resources

Locality: Tolbachik Volcano, Kamchatka, Russia
Formula: K₂Cu₃O(SO₄)₃
Availability: Sold
Size: 2.2 x 1 x 1.1 cm - Thumbnail
Tagged: copper

Rich and excellent emerald green crystal group throughout specimen. ID by Dr. Igor Pekov. Fedovite is very rare worldwide occuring in just two main deposits.

Fedotovite

Formula: K₂Cu₃O(SO₄)₃
Crystal System: Monoclinic
Crystal Habit: Encrustations
Cleavage: Perfect, None, None
Luster: Vitreous - Silky
Color: blue green, emerald green
Streak: light green
Class: Monoclinic - Prismatic
Hardness: 2.5

On Dakota Matrix: Previously Sold Fedotovite
On Dakota Matrix: Other Available Fedotovite
WebMineral: View Fedotovite
Mindat: View Fedotovite

Fluorite - 65920

Fluorite - 65920

Fluorite

#65920

$85.00 - Available
Details
Add to Cart
Add to Favorites

Details
Data
Provenance
Resources

Locality: Denton mine, Hardin Co., Illinois, United States
Formula: CaF₂
Availability: Available
Price: $85.00
Size: 7 x 5 x 6 cm - Sm Cabinet

Display specimen mounted on an acrylic square. It is deep purple in color with an area of Sphalerite crystals at the base. Very nice piece.

Fluorite

Formula: CaF₂
Crystal System: Isometric
Crystal Habit: Crystalline - Coarse, Massive - Granular, Disseminated
Cleavage: Three perfect, octahedral cleavages.
Luster: Vitreous (Glassy)
Color: purple, clear, yellow, green, red, blue
Streak: white
Geological Setting: Occurs in a wide range of geologic environments including low temperature Missississippi Valley lead-zinc deposits, hydrothermal gold deposits, Alpine cleft metamorphic environments
Class: Isometric - Hexoctahedral
Fracture: Uneven
Hardness: 4

Mineralpedia: View Fluorite
On Dakota Matrix: Previously Sold Fluorite
On Dakota Matrix: Other Available Fluorite
WebMineral: View Fluorite
Mindat: View Fluorite

SOLD

Gauthierite - 65569

Gauthierite - 65569

Gauthierite

#65569

Details
Data
Provenance
Resources

Locality: Shinkolobwe, Katanga, Democratic Republic of Congo
Formula: KPb[(UO₂)₇O₅(OH)₇] 8H₂O
Availability: Sold
Size: 0.4 x 0.2 x 0.2 cm - Thumbnail
Special Info: Radioactive!!
Special Info: Type & Only Locality

This is the type and only locality of Gauthierite. The crystals are very small but look like Wulfenite crystals.

Gauthierite

Special Info: Radioactive!!
Special Info: Type & Only Locality

Mineralpedia: View Gauthierite
On Dakota Matrix: Previously Sold Gauthierite
On Dakota Matrix: Other Available Gauthierite
WebMineral: View Gauthierite
Mindat: View Gauthierite

SOLD

Giuseppettite - BAC65914

Giuseppettite - BAC65914

Giuseppettite

#BAC65914

Details
Data
Provenance
Resources

Locality: Sacrofano, Roma, Lazio, Italy
Formula: Na₄₂K₁₆Ca₆Si₄₈Al₄₈O₁₉₂(SO₄)₁₀Cl₂·5H₂O
Availability: Sold
Size: 1.5 x 1 x 1 cm - Thumbnail
Special Info: Type Locality

Light purple sugary mass. Rare.

Giuseppettite

Formula: Na₄₂K₁₆Ca₆Si₄₈Al₄₈O₁₉₂(SO₄)₁₀Cl₂·5H₂O
Crystal System: Trigonal
Crystal Habit: Anhedral Grains
Cleavage: None, None, None
Luster: Vitreous (Glassy)
Color: light violet blue
Streak: white
Class: Trigonal - Ditrigonal Pyramidal
Hardness: 6-7

Collection: William & Anne Cook Collection
Special Info: Type Locality

Mineralpedia: View Giuseppettite
On Dakota Matrix: Previously Sold Giuseppettite
On Dakota Matrix: Other Available Giuseppettite
WebMineral: View Giuseppettite
Mindat: View Giuseppettite

SOLD

Hypercinnabar - BAC65930

Hypercinnabar - BAC65930

Hypercinnabar

#BAC65930

Details
Data
Provenance
Resources

Locality: Mount Diablo mine, Contra Costa Co., California, United States
Formula: HgS
Availability: Sold
Size: 3 x 2 x 1.5 cm - Thumbnail
Tagged: sulfide
Special Info: Type Locality

Shiny silverly black masses. Rare.

Hypercinnabar

Formula: HgS
Crystal System: Hexagonal
Crystal Habit: Microscopic Crystals
Cleavage: None, None, None
Luster: Adamantine
Color: red, purple black
Streak: reddish black
Class: Hexagonal
Hardness: 3

Collection: William & Anne Cook Collection
Special Info: Type Locality

On Dakota Matrix: Previously Sold Hypercinnabar
On Dakota Matrix: Other Available Hypercinnabar
WebMineral: View Hypercinnabar
Mindat: View Hypercinnabar

SOLD

Iodargyrite - 65954

Iodargyrite - 65954

Iodargyrite

#65954

Details
Data
Provenance
Resources

Locality: Bisbee, Cochise Co., Arizona, United States
Formula: AgI
Availability: Sold
Size: 6 x 4 x 3 cm - Sm Cabinet
Tagged: silver

Great specimen for a classic locality. There is a 2.5 x 1.5cm vug filled with tiny, distorted, dark green and waxy looking Iodargyrite.

Iodargyrite

Formula: AgI
Crystal System: Hexagonal
Crystal Habit: Platy
Cleavage: Perfect, None, None
Luster: Adamantine - Greasy
Color: colorless, pale yellow, yellow, greenish yellow, gray
Streak: white
Class: Hexagonal - Dihexagonal Pyramidal
Fracture: Conchoidal - Uneven
Hardness: 1.5-2

Collection: Don Phillips Collection

Mineralpedia: View Iodargyrite
On Dakota Matrix: Previously Sold Iodargyrite
On Dakota Matrix: Other Available Iodargyrite
WebMineral: View Iodargyrite
Mindat: View Iodargyrite

All photos by Dakota Matrix and are Copyrighted © and may not be used without permission. Copyright © 2025 - Dakota Matrix Minerals, Inc. Privacy | Terms & Conditions | Site Map

DakotaMatrix.com makes use of JavaScript

Please enable it in your browser's preferences, should you need assistance, follow this link for help enabling javascript in your browser.