Checkout

0 item @ $0.00

Home | My Cart | Login | Register

Recently Released New Additions

Hide Solds

Rare Mineral Species

Thursday, 09 January 2025 06:00 PM

Introducing the "Rare Mineral Species" gallery which is part of our New Additions galleries. This gallery contains mineral specimens for sale including clinoclase, cuzticite, ferro-eckermannite, ferro-richterite, florencite-(ce), and hannebachite and more from places like Majuba Hill mine, Pershing Co., Nevada, United States, Moctezuma mine, Moctezuma, Sonora, Mexico, Khan Bogdo Massif, Gobi Desert, Mongolia, Brunsheon Gruvan, Sweden, Papachacra, Belen dept., Catamarca, Argentina, and Eifel, North Rhine-Westphalia, Germany.

SOLD

Clinoclase - JD65095

Clinoclase - JD65095

Clinoclase

#JD65095

Details
Data
Provenance
Resources

Locality: Majuba Hill mine, Pershing Co., Nevada, United States
Formula: Cu₃AsO₄(OH)₃
Availability: Sold
Size: 7 x 4 x 2.5 cm - Sm Cabinet
Tagged: arsenate , copper

Cobalt blue acicular crystals in groups to 2mm.

Clinoclase

Formula: Cu₃AsO₄(OH)₃
Crystal System: Monoclinic
Crystal Habit: Crystals rare, typically needlelike, tabular, as rosettes and radial fibrous spherical aggregates, as crusts and coatings.
Cleavage: perfect
Luster: Vitreous, pearly on cleavages
Color: Dark greenish blue to greenish black; in transmitted light, blue-green.
Streak: Bluish green
Geological Setting: A rare secondary mineral in the oxidized zone of some arsenic-rich hydrothermal base-metal deposits.
Class: 2/m - Prismatic
Fracture: Uneven
Hardness: 2.5 - 3

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

SOLD

Cuzticite - JD65261

Cuzticite - JD65261

Cuzticite

#JD65261

Details
Data
Provenance
Resources

Locality: Moctezuma mine, Moctezuma, Sonora, Mexico
Formula: Fe³⁺₂Te⁶⁺O₆·3H₂O
Availability: Sold
Size: 2 x 1 x 1 cm - Thumbnail
Tagged: tellurium
Special Info: Type Locality

Interesting brassy yellow crystals less than 0.5mm in size. Cuzticite is a very rare tellurium mineral. This is the first specimen I have ever seen.

Cuzticite

Formula: Fe³⁺₂Te⁶⁺O₆·3H₂O
Crystal System: Hexagonal
Crystal Habit: Encrustations, Scaly, Stalactitic
Cleavage: Good, None, None
Luster: Adamantine
Color: brown, brownish yellow, yellow
Class: Hexagonal
Hardness: 3

Collection: John Dagenais Collection
Special Info: Type Locality

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

SOLD

Ferro-eckermannite - BAC65276

Ferro-eckermannite - BAC65276

Ferro-Eckermannite

with Elpidite - #BAC65276

Details
Data
Provenance
Resources

Locality: Khan Bogdo Massif, Gobi Desert, Mongolia
Formula: NaNa₂(Fe²⁺₄Al)Si₈O₂₂(OH)₂
Availability: Sold
Size: 3 x 2 x 2.5 cm - Thumbnail

Green Ferro-eckermannite with reddish crystals of Elpidite.

Ferro-Eckermannite

Formula: NaNa₂(Fe²⁺₄Al)Si₈O₂₂(OH)₂
Crystal System: Monoclinic
Color: green
Class: Monoclinic - Prismatic
Hardness: 5-6

Mineralpedia: View Ferro-eckermannite
On Dakota Matrix: Previously Sold Ferro-Eckermannite
On Dakota Matrix: Other Available Ferro-Eckermannite
WebMineral: View Ferro-Eckermannite
Mindat: View Ferro-Eckermannite

SOLD

Ferro-richterite - BAC65271

Ferro-richterite - BAC65271

Ferro-Richterite

#BAC65271

Details
Data
Provenance
Resources

Locality: Brunsheon Gruvan, Sweden
Formula: NaNaCaFe²⁺₅Si₈O₂₂(OH)₂
Availability: Sold
Size: 3.3 x 1.7 x 1.1 cm - Miniature

Platy elongated yellow crystals.

Ferro-Richterite

Collection: William & Anne Cook Collection

Mineralpedia: View Ferro-richterite
On Dakota Matrix: Previously Sold Ferro-Richterite
On Dakota Matrix: Other Available Ferro-Richterite
WebMineral: View Ferro-Richterite
Mindat: View Ferro-Richterite

Florencite-(Ce) - BAC65274

Florencite-(Ce) - BAC65274

Florencite-(Ce)

#BAC65274

$30.00 - Available
Details
Add to Cart
Add to Favorites

Details
Data
Provenance
Resources

Locality: Papachacra, Belen dept., Catamarca, Argentina
Formula: CeAl₃(PO₄)₂(OH)₆
Availability: Available
Price: $30.00
Size: 2 x 1.2 x 1 cm - Thumbnail
Tagged: phosphate , REE mineral

Orange crystal to about 0.3mm on Microcline matrix.

Florencite-(Ce)

Formula: CeAl₃(PO₄)₂(OH)₆
Crystal System: Trigonal
Cleavage: Good, None, None
Luster: Resinous - Greasy
Color: colorless, gray, light yellow, pink
Streak: white
Class: Trigonal - Hexagonal Scalenohedral
Fracture: Brittle - Conchoidal
Hardness: 5-6

Collection: William & Anne Cook Collection

Mineralpedia: View Florencite-(Ce)
On Dakota Matrix: Previously Sold Florencite-(Ce)
On Dakota Matrix: Other Available Florencite-(Ce)
WebMineral: View Florencite-(Ce)
Mindat: View Florencite-(Ce)

Hannebachite - BAC65149

Hannebachite - BAC65149

Hannebachite

#BAC65149

$60.00 - Available
Details
Add to Cart
Add to Favorites

Details
Data
Provenance
Resources

Locality: Eifel, North Rhine-Westphalia, Germany
Formula: (CaSO₃)₂·H₂O
Availability: Available
Price: $60.00
Size: 2.8 x 2 x 1.9 cm - Thumbnail

Very thin platy crystals less than 1mm in vugs.

Hannebachite

Formula: (CaSO₃)₂·H₂O
Crystal System: Orthorhombic
Cleavage: Perfect, None, None
Luster: Vitreous (Glassy)
Color: colorless
Streak: white
Class: Orthorhombic - Dipyramidal
Hardness: 3.5

Collection: William & Anne Cook Collection

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

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.