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Rare Minerals

Monday, 20 January 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 aegerine, legrandite, meliphanite, quartz, ranunculite, and stannite and more from places like Mont Saint-Hilaire, Montérégie, Québec, Canada, Mina Ojuela, Mapimi, Durango, Mexico, Sakhariok Massif, Kola Peninsula, Russia, San Gabriel, Rio Grande do Sul, Brazil, Kobokobo Pegmatite, Sud-Kivu, Democratic Republic of Congo, and Zeehan, Tasmania, Australia.

Aegerine

#BAC65355

$15.00 - Available
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Locality: Mont Saint-Hilaire, Montérégie, Québec, Canada
Formula: NaFe³⁺Si₂O₆
Availability: Available
Price: $15.00
Size: 4.1 x 0.2 x 0.3 cm - Miniature

Slender, terminated single crystal.

Collection: William & Anne Cook Collection

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

Legrandite

with Adamite - #BAC65349

$175.00 - Available
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Locality: Mina Ojuela, Mapimi, Durango, Mexico
Formula: Zn₂AsO₄(OH)·H₂O
Availability: Available
Price: $175.00
Size: 6 x 4.5 x 5 cm - Sm Cabinet
Tagged: arsenate

Adamite with Legrandite is not a typical association. The Adamite on this specimen light yellow with colorless tips. The Legrandite crystals are up to 4mm.

Legrandite

Formula: Zn₂AsO₄(OH)·H₂O
Crystal System: Monoclinic
Crystal Habit: Crystalline - Fine, Prismatic
Cleavage: Imperfect, None, None
Luster: Vitreous (Glassy)
Color: yellow, yellowish orange
Streak: white
Class: Monoclinic - Prismatic
Fracture: Brittle - Conchoidal
Hardness: 4-5

Collection: William & Anne Cook Collection

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

Meliphanite

#63684

$50.00 - Available
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Locality: Sakhariok Massif, Kola Peninsula, Russia
Formula: Ca₄(Na,Ca)₄Be₄AlSi₇O₂₄(F,O)₄
Availability: Available
Price: $50.00
Size: 2.2 x 1.2 x 1 cm - Thumbnail
Tagged: beryllium

Glassy, lemon yellow, crystals to 4mm across.

Meliphanite

Formula: Ca₄(Na,Ca)₄Be₄AlSi₇O₂₄(F,O)₄
Crystal System: Tetragonal
Crystal Habit: Prismatic, Tabular
Cleavage: Perfect, Distinct, None
Luster: Vitreous (Glassy)
Color: colorless, yellow, yellowish red, red
Streak: white
Class: Tetragonal - Disphenoidal
Fracture: Brittle - Uneven
Hardness: 5-5.5

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

Quartz

ps after Anhydrite - #BAC65309

$80.00 - Available
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Locality: San Gabriel, Rio Grande do Sul, Brazil
Formula: SiO₂
Availability: Available
Price: $80.00
Size: 5.5 x 5 x 4 cm - Sm Cabinet

I found no reference to this locality, perhaps you might know?

Originally labeled as Quartz ps after Laumontite, but looks more like a pseudomorph (or epimorph) after Anhydrite. The centers of the crystals are hollowed out. Any which way, it a nice example of replacement.