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Roweite Calcite Olshanskyite & Andradite

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PMN756601

Roweite Calcite Olshanskyite & Andradite

Description Tabs

Description
Locality: 
Shijiangshan Mine, Hexigten Banner, Chifeng City, Inner Mongolia, China (Peoples Republic)
Class: 
Combination
Size Range: 
Miniature (4.5-7 cm)
Size: 
5 × 6 × 3.5 cm
Largest Crystal: 
1.50cm
Weight: 
73.00gr
Description

Orange flowers of roweite , one on an andradite 'ridge' showing brown well defined crsytals of andradite. The other next to sharp olshankyite and on a calcite cluster. A complex combination piece, only a few had this rich paragnesis with the calcite.This location is the only location in the world where combination specimens like this have been found - and it seems to have been a limited occurance as well, roweite being a borate that has never before been seen in crystals, and olshankyite noted for it's sizeable crystals. From a find made in 2017.

Mineral Data
What's on the rock

Roweite

Formula: 
Ca2Mn2+2B4O7(OH)6
Strunz: 
6.DA.25
Hardness: 
5.0
Type Locality: 
Franklin Mine, Franklin, Franklin Mining District, Sussex Co., New Jersey, USA

Calcite

Polymorph of: 
Formula: 
CaCO3
Strunz: 
5.AB.05
Crystal System: 
Trigonal
Hardness: 
3.0
Streak: 
White

Olshanskyite

Formula: 
Ca3[B(OH)4]4(OH)2
Strunz: 
6.CA.55
Hardness: 
4.0
Type Locality: 
Titovskoe B deposit, Tas-Khayakhtakh Range, Dogdo River Basin, Polar Yakutia, Sakha Republic (Saha Republic; Yakutia), Eastern-Siberian Region, Russia

Andradite

Formula: 
Ca3Fe3+2(SiO4)3
Strunz: 
9.AD.25
Crystal System: 
Isometric
Hardness: 
6.5 - 7.0
Streak: 
White
Type Locality: 
Drammen, Buskerud, Norway