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Rare Mineral Species

Monday, 25 November 2024 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 janhaugite, kobeite-(y), marrucciite, mazzite-mg, molybdofornacite, and nickenichite and more from places like Gjerdingen, Nordmarka, Lunner, Oppland, Norway, Ushio mine, Omiya-cho, Kyoto Prefecture, Japan, Buca della Vena mine, Apuan Alps, Lucca prov., Tuscany, Italy, Mont Semiol, Châtelneuf, Loire, Rhône-Alpes, France, Alice mine, Goodsprings dist., Clark Co., Nevada, United States, and Nickenicher Sattel, Nickenich, Eifel Volcanic Fields, Germany.

SOLD

Janhaugite

#BAC64940

Details
Data
Provenance
Resources

Locality: Gjerdingen, Nordmarka, Lunner, Oppland, Norway
Formula: (Na,Ca)₃(Mn²⁺,Fe²⁺)₃(Ti,Zr,Nb)₂(Si₂O₇)₂O₂(OH,F)₂
Availability: Sold
Size: 3 x 2 x 2 cm - Thumbnail
Special Info: Type Locality

Orang prismatic crystals to 3mm. Very rare - only two localities on Earth.

Janhaugite

Formula: (Na,Ca)₃(Mn²⁺,Fe²⁺)₃(Ti,Zr,Nb)₂(Si₂O₇)₂O₂(OH,F)₂
Crystal System: Monoclinic
Crystal Habit: Prismatic, Striated, Anhedral Grains
Cleavage: Distinct, None, None
Luster: Vitreous (Glassy)
Color: reddish brown
Streak: light brown
Class: Monoclinic - Prismatic
Fracture: Brittle
Hardness: 5

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

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

SOLD

Kobeite-(Y)

#BAC64943

Details
Data
Provenance
Resources

Locality: Ushio mine, Omiya-cho, Kyoto Prefecture, Japan
Formula: (Y,U)(Ti,Nb)₂(O,OH)₆
Availability: Sold
Size: 2.5 x 2 x 1.3 cm - Thumbnail
Tagged: REE mineral
Special Info: Radioactive!!

Slender black crystals to 4mm. It is probably metamict as it is composed of uranium and yttrium with titanium and niobium. It is fairly rare.

Kobeite-(Y)

Formula: (Y,U)(Ti,Nb)₂(O,OH)₆
Crystal System: Isometric
Crystal Habit: Metamict, Prismatic, Radial
Cleavage: None, None, None
Luster: Vitreous - Resinous
Color: brown, brownish black, dark brown, black
Streak: reddish brown
Class: Isometric
Fracture: Brittle - Conchoidal
Hardness: 5.5

Collection: William & Anne Cook Collection
Special Info: Radioactive!!

On Dakota Matrix: Previously Sold Kobeite-(Y)
On Dakota Matrix: Other Available Kobeite-(Y)
WebMineral: View Kobeite-(Y)
Mindat: View Kobeite-(Y)

SOLD

Marrucciite

#BAC64939

Details
Data
Provenance
Resources

Locality: Buca della Vena mine, Apuan Alps, Lucca prov., Tuscany, Italy
Formula: Hg₃Pb₁₆Sb₁₈S₄₆
Availability: Sold
Size: 1.8 x 1.4 x 1.8 cm - Thumbnail
Tagged: sulfide
Special Info: Type Locality

Marrucciite is a very rare mercuric - lead - antimony sulfide found at only two localities wolrdwide. This is a very good specimen showinh as slender needles at random and radiating habits.