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Rare Minerals

Sunday, 16 April 2023 06:00 PM

Introducing the "Rare Minerals" gallery which is part of our New Additions galleries. This gallery contains mineral specimens for sale including barysilite, ferri-katophorite, geffroyite, kolwezite, lepidolite, and mckelveyite-(y) and more from places like Parker Shaft, Franklin, Sussex Co., New Jersey, United States, Kipawa alkaline complex, Quebec, Canada, San Miguel mine, Moctezuma, Sonora, Mexico, Mupine mine, Kamoto, Kolwezi dist., DR Congo, Harding mine, Taos Co., New Mexico, United States, and Mont Saint-Hilaire, Montérégie, Québec, Canada.

SOLD

Barysilite

with Willemite - #BAC61454

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Data
Provenance
Resources

Locality: Parker Shaft, Franklin, Sussex Co., New Jersey, United States
Formula: Pb₈Mn(Si₂O₇)₃
Availability: Sold
Size: 1 x 0.7 x 0.3 cm - Thumbnail

Lilac, platy Barysilite with golassy light green Willemite. It is an excellent specimen, for this fairly rare mineral usually coveted by Franklin collectors.

Barysilite

Formula: Pb₈Mn(Si₂O₇)₃
Crystal System: Trigonal
Crystal Habit: Massive - Lamellar
Cleavage: Perfect, None, None
Luster: Adamantine
Color: white, gray
Streak: white
Class: Trigonal - Hexagonal Scalenohedral
Hardness: 3

Collection: William & Anne Cook Collection

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

SOLD

Ferri-Katophorite

#61471

Details
Provenance
Resources

Locality: Kipawa alkaline complex, Quebec, Canada
Formula: Na(CaNa)(Mg₄Fe³⁺)(AlSi7O₂₂)(OH)₂
Availability: Sold
Size: 8 x 5.5 x 5 cm - Sm Cabinet

Large, green, blocky crystals of Ferri-katophorite with Fluorite.

On Dakota Matrix: Previously Sold Ferri-Katophorite
On Dakota Matrix: Other Available Ferri-Katophorite
WebMineral: View Ferri-Katophorite
Mindat: View Ferri-Katophorite

Geffroyite

#BAC61507

$75.00 - Available
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Data
Provenance
Resources

Locality: San Miguel mine, Moctezuma, Sonora, Mexico
Formula: (Cu,Fe,Ag)₉Se₈
Availability: Available
Price: $75.00
Size: 2.3 x 2 x 1.4 cm - Thumbnail
Tagged: copper , selenium , silver

Silvery crystal grains to 0.5mm and in aggregates to around 2mm. The Geffroyite is scattered throughout the matrix not just the arrowed areas.

Geffroyite

Formula: (Cu,Fe,Ag)₉Se₈
Crystal System: Isometric
Luster: Metallic
Color: bronze brown
Class: Isometric - Hexoctahedral
Hardness: 2.5

Collection: William & Anne Cook Collection

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

Kolwezite

#BAC61450

$275.00 - Available
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Locality: Mupine mine, Kamoto, Kolwezi dist., DR Congo
Formula: CuCoCO₃(OH)₂
Availability: Available
Price: $275.00
Size: 7.5 x 5.5 x 2.5 cm - Sm Cabinet
Tagged: carbonate , copper , cobalt

A large vug 3 x 1.5cm filled with fuzzy or velvety looking green Kolwezite. In-hand the Kolwezite is more of an olive color. Exceptional specimen for a fairly rare mineral found in basically six worldwide deposits.