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Tephroite Rhodonite Jasper & Manganoan Calcite

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RFJ1172214

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Description
Locality: 
Hamayokokawa Mine, Kamiina District, Nagano Prefecture, Honshu Island, Japan
Class: 
Massive/Crystalline
Size Range: 
Miniature (4.5-7 cm)
Size: 
4.2 × 6.4 × 3.5 cm
Description

Very interesting combination, although the Hamayokokawa Mine is a bedded Manganese deposit, it got thermally metamorphosed by magma intrusion, it seems that a certain part of the mine got hydrothermaly affected, which produced Jasper breccia with Mangan mineralization. A report from the 1940s is mentioning hydrothermal replacement in the mine.

Mineral Data
What's on the rock

Tephroite

Formula: 
Mn2+2SiO4
Strunz: 
9.AC.05
Crystal System: 
Orthorhombic Forms short prismatic crystals.
Hardness: 
6.0
Streak: 
Pale gray
Type Locality: 
Sterling Mine, Sterling Hill, Ogdensburg, Franklin Mining District, Sussex Co., New Jersey, USA

Rhodonite

Formula: 
MnSiO3
Strunz: 
9.DK.05
Crystal System: 
Triclinic
Hardness: 
5.5 - 6.5
Streak: 
White
Type Locality: 
Kaiser Franz Mine (König Wilhelm Mine), Schävenholz (Schebenholz; Schäbenholz), Elbingerode, Harz, Saxony-Anhalt, Germany

Jasper

Variety Of: 

Chalcedony

Hardness: 
6.5 - 7.0
Hardness: 
0.0

Manganoan Calcite

Variety Of: 

Calcite

Formula: 
CaCO3
Strunz: 
5.AB.05
Hardness: 
3.0
Formula: 
(Ca,Mn)CO3
Hardness: 
0.0

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