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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 neptunite, noelbensonite, paxite, poughite, rustumite, and sazhinite-(ce) and more from places like Dallas Gem mine, San Benito Co., California, United States, Cerchiara mine, Borghetto di Vara, La Spezia, Liguria, Italy, Černý Důl, Trutnov dist., Hradec Králové, Czech Republic, Moctezuma mine, Moctezuma, Sonora, Mexico, Negra Mine, Maconi, Queretaro, Mexico, and Aris quarries, Windhoek dist., Khomas Region, Namibia.

SOLD

Neptunite

on Joaquinite-(Ce) - #BAC65278

Details
Data
Provenance
Resources

Locality: Dallas Gem mine, San Benito Co., California, United States
Formula: KNa₂LiFe²⁺₂Ti₂Si₈O₂₄
Availability: Sold
Size: Micromount

This is just a small micromount, but the dark red Neptunite crystal is on a perfect Joaquinite crystal.

Neptunite

Formula: KNa₂LiFe²⁺₂Ti₂Si₈O₂₄
Crystal System: Monoclinic
Crystal Habit: Prismatic, Tabular, Crystalline - Coarse
Cleavage: Good, None, None
Luster: Vitreous (Glassy)
Color: black, red
Streak: brown
Class: Monoclinic - Domatic
Fracture: Conchoidal
Hardness: 5-6

Collection: William & Anne Cook Collection

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

SOLD

Noelbensonite

with Namansilite - #BAC65126

Details
Data
Provenance
Resources

Locality: Cerchiara mine, Borghetto di Vara, La Spezia, Liguria, Italy
Formula: BaMn³⁺₂Si₂O₇(OH)₂·H₂O
Availability: Sold
Size: 3 x 2 x 1.5 cm - Thumbnail

Silky red Namansilite with darker red Noelbensonite.

Noelbensonite

Formula: BaMn³⁺₂Si₂O₇(OH)₂·H₂O
Crystal System: Orthorhombic
Crystal Habit: Blocky, Cryptocrystalline, Crystalline - Fine
Cleavage: None, None, None
Luster: Vitreous - Greasy
Color: dark brown
Streak: yellow brown
Class: Orthorhombic - Dipyramidal
Fracture: Brittle - Uneven
Hardness: 4

Collection: William & Anne Cook Collection

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

SOLD

Paxite

with Kutinaite - #JD65268

Details
Data
Provenance
Resources

Locality: Černý Důl, Trutnov dist., Hradec Králové, Czech Republic
Formula: CuAs₂
Availability: Sold
Size: 0.4 x 0.5 x 0.5 cm - Thumbnail
Tagged: copper
Special Info: Type Locality

Black matrix composed of both Paxite and Kutinaite and unknown blue mineral.

Paxite

Formula: CuAs₂
Crystal System: Monoclinic
Crystal Habit: Massive
Cleavage: Perfect, None, None
Luster: Metallic
Color: black, black, steel gray
Streak: black
Class: Monoclinic - Prismatic
Hardness: 3.5-4

Collection: John Dagenais Collection
Special Info: Type Locality

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

SOLD

Poughite

with Zemannite - #JD65279

Details
Data
Provenance
Resources

Locality: Moctezuma mine, Moctezuma, Sonora, Mexico
Formula: Fe³⁺₂(Te⁴⁺O₃)₂SO₄·3H₂O
Availability: Sold
Size: 7.5 x 4.5 x 2 cm - Sm Cabinet
Tagged: tellurium

Excellent yellow spherulitic Poughite crystals with good coverage on one side and reddish brown prismatic crystals of Zemannite on the other side. Very nice piece, best I've seen.