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Numanoite & Borcarite

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SKY769367

Numanoite & Borcarite

Rare Mineral

Description Tabs

Description
Locality: 
Fuka Mine, Bitchu-cho, Takahashi, Honshu Island, Japan
Class: 
Crystals on Matrix
Size Range: 
Micromount (under 1cm)
Size: 
0.8 × 0.7 × 0.3 cm
Description

Very pale green inclusions of the very rare borate numanoite, in sharp crystals of the also rare borate borcarite with which it forms a partial series, from the the type locality for numanoite.

Crystals of borcarite in this quality are rarely seen in the mineral market.

One locality mineral for numanoite and only 5 localities known wordwide for borcarite.

 

Mineral Data
What's on the rock

Numanoite

Formula: 
Ca4Cu(B4O6(OH)6)(CO3)2
Strunz: 
6.DA.40
Hardness: 
4.5 - 0.0
Type Locality: 
Fuka mine, Fuka, Bicchu-cho (Bitchu-cho), Takahashi City, Okayama Prefecture, Chugoku Region, Honshu Island, Japan

Borcarite

Formula: 
Ca4Mg(B4O6(OH)6)(CO3)2
Strunz: 
6.DA.40
Hardness: 
4.0
Type Locality: 
Snezhnoe B oreoccurrence, Izvestkovyi Stream, Titovskoe B deposit, Tas-Khayakhtakh Range, Dogdo River Basin, Polar Yakutia, Sakha Republic (Saha Republic; Yakutia), Eastern-Siberian Region, Russia

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