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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 achyrophanite, akatoreite, alluaivite, ammonioalunite, arsenopyrite, and ashcroftine-(y) and more from places like Tolbachik Volcano, Kamchatka, Russia, Akatore Creek, Clutha dist., Otago Region, New Zealand, Alluaiv Mt., Lovozero Massif, Kola Peninsula, Russia, Kladno, Bohemia, Czech Republic, Nikolaevskiy mine, Dal'negorsk, Russia, and Mont Saint-Hilaire, Montérégie, Québec, Canada.

SOLD

Achyrophanite

#63640

Details
Data
Provenance
Resources

Locality: Tolbachik Volcano, Kamchatka, Russia
Formula: (K,Na)₃(Fe³⁺,Ti,Al,Mg)₅O₂(AsO₄)₅
Availability: Sold
Size: 2.5 x 1.1 x 1.3 cm - Thumbnail
Special Info: XRD Confirmed
Special Info: EDS Confirmed
Special Info: Type & Only Locality
Special Info: Author's Material

Very rich specimen loaded with yellowish brown to colorless crystals in cavaties of scoria from the Tolbachik. This is a specimen from the research collection of Dr. Igor Pekov, when he described the mineral.

The more exact locality is:

Arsenatnaya fumarole, Second scoria cone, Northern Breakthrough), Great Fissure eruption, Tolbachik Volcanic field, Milkovsky District, Kamchatka Krai, Russia

Achyrophanite

Special Info: XRD Confirmed
Special Info: EDS Confirmed
Special Info: Type & Only Locality
Special Info: Author's Material

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

SOLD

Akatoreite

with Rhodonite - #BAC65262

Details
Data
Provenance
Resources

Locality: Akatore Creek, Clutha dist., Otago Region, New Zealand
Formula: Mn²⁺₉Al₂Si₈O₂₄(OH)₈
Availability: Sold
Size: 1.5 x 0.5 x 0.4 cm - Thumbnail

Pink Rhodonite with light brown, glassy Akatoreite.

Akatoreite

Formula: Mn²⁺₉Al₂Si₈O₂₄(OH)₈
Crystal System: Triclinic
Crystal Habit: Wheat Sheaf
Cleavage: Perfect, Good, None
Luster: Vitreous (Glassy)
Color: orange, brown
Streak: yellow white
Class: Triclinic - Pinacoidal
Hardness: 6

Collection: William & Anne Cook Collection

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

SOLD

Alluaivite

#BAC65127

Details
Data
Provenance
Resources

Locality: Alluaiv Mt., Lovozero Massif, Kola Peninsula, Russia
Formula: Na₁₉(Ca,Mn²⁺)₆(Ti,Nb)₃Si₂₆O₇₄Cl·2H₂O
Availability: Sold
Size: 0.9 x 0.7 x 0.3 cm - Thumbnail
Special Info: Type Locality

Light yellow crystal grain to about 1mm. Alluaivite is a rare titanium-niobium mineral found in basically two places on Earth.

Alluaivite

Formula: Na₁₉(Ca,Mn²⁺)₆(Ti,Nb)₃Si₂₆O₇₄Cl·2H₂O
Crystal System: Trigonal
Cleavage: None, None, None
Luster: Vitreous (Glassy)
Color: brownish pink, colorless
Streak: white
Class: Trigonal - Hexagonal Scalenohedral
Hardness: 5-6

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

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

SOLD

Ammonioalunite

#BAC65221

Details
Data
Provenance
Resources

Locality: Kladno, Bohemia, Czech Republic
Formula: NH₄Al₃(SO₄)₂(OH)₆
Availability: Sold
Size: 1.3 x 1 x 0.4 cm - Thumbnail

Ugly creamy brown mass undeserving of IMA status.

Ammonioalunite

Formula: NH₄Al₃(SO₄)₂(OH)₆
Crystal System: Trigonal
Crystal Habit: Efflorescences, Massive - Granular, Rhombohedral Crystals
Cleavage: Good, None, None
Luster: Vitreous (Glassy)
Color: gray white, white
Streak: white
Class: Trigonal - Hexagonal Scalenohedral
Hardness: 2-3

Collection: William & Anne Cook Collection

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

SOLD

Arsenopyrite

with Galena & Sphalerite - #65199

Details
Data
Provenance
Resources

Locality: Nikolaevskiy mine, Dal'negorsk, Russia
Formula: FeAsS
Availability: Sold
Size: 8 x 4 x 5.5 cm - Sm Cabinet
Tagged: sulfide

Combination specimen with silvery Arsenopyrite crystals to 8mm, dull silvery Galena crystals and black striated Sphalerite.

Arsenopyrite

Formula: FeAsS
Crystal System: Monoclinic
Crystal Habit: Striated, Euhedral Crystals, Prismatic
Cleavage: one distinct
Luster: Metallic
Color: tin white, light steel gray
Streak: black
Geological Setting: Widespread. Most commonly found in medium to high temperature veins.
Class: Monoclinic - Prismatic
Fracture: Brittle
Hardness: 5.5 to 6