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Roweite Magnetite & Johnbaumite

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PMN687480

Roweite Magnetite & Johnbaumite

Description Tabs

Description
Locality: 
Shijiangshan Mine, Hexigten Banner, Chifeng City, Inner Mongolia, China (Peoples Republic)
Class: 
Crystals on Matrix
Size Range: 
Small cabinet (7-10 cm)
Size: 
4 × 8.5 × 6.5 cm
Largest Crystal: 
2.50cm
Weight: 
257.00gr
Description

Roweite and johnbaumite clusters on the disctinctive matrix consisting of a mix green andradite and rich in white johnbaumite. Small crystals of andradite are present on the specimen (covered by a clay mineral). There is also a well formed magenetite crystal with a single olshanskyite resting against it. A very good, representative specimen for this 2017 find that re-defined the standard for roweite, johnbaumite and olshanskyite. Read all about this mine and it's minerals in Lapis magazine.
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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

Magnetite

Formula: 
Fe2+Fe3+2O4
Strunz: 
4.BB.05
Crystal System: 
Isometric
Hardness: 
5.5 - 6.5
Streak: 
Black

Johnbaumite

Formula: 
Ca5(AsO4)3OH
Strunz: 
8.BN.05
Hardness: 
4.5
Streak: 
White
Type Locality: 
Franklin Mine, Franklin, Franklin Mining District, Sussex Co., New Jersey, USA