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Romanèchite & Arseniosiderite

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MNT890055

Romanèchite & Arseniosiderite

Type Locality

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Description
Locality: 
Romanèche-Thorens, La Chapelle-de-Guinchay, Saône-et-Loire, Bourgogne-Franche-Comté, France
Class: 
Massive/Crystalline
Size Range: 
Miniature (4.5-7 cm)
Size: 
6 × 4.5 × 3.5 cm
Weight: 
86.00gr
Description

Old and interesting classic specimen: from the biggest manganese deposit in France, composed of two veins in a granite and several stratiform deposits in Triassic/Liassic sediments, comes this sample of romanechite intergrown with fibrous arseniosiderite. Discovered in 1750, this mine and the type locality for both species was operated under the village. The last mining period started in 1920 and closed in 1957. The collector who wrote the old label old is unknown, but the specimen may have been handled later by Louis Vésignié: a (typical) inventory number (2052P) was added later to the label.

Mineral Data
What's on the rock

Romanèchite

Formula: 
(Ba,H2O)2Mn5O10
Strunz: 
4.DK.10
Hardness: 
5.0 - 6.0
Type Locality: 
Manganese deposit, Romanèche-Thorens, La Chapelle-de-Guinchay, Saône-et-Loire, Burgundy, France

Arseniosiderite

Formula: 
Ca2Fe3+3(AsO4)3O2·3H2O
Strunz: 
8.DH.30
Crystal System: 
Monoclinic
Hardness: 
4.5
Type Locality: 
Manganese deposit, Romanèche-Thorens, La Chapelle-de-Guinchay, Saône-et-Loire, Burgundy, France

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Thank you for your interest in my offers! Payment is possible via Paypal, bank transfer or cash if you pick up the item(s) personally. Bank data will be provided after settling the auction/transaction(s) if needed.

In case you are not happy with a specimen, you may send it back within 4 weeks. After receipt, i will refund the price minus shipping costs. Please inform me before sending an item back. If you have any questions (or maybe complaints) please feel free to contact me.

Best regards Roger

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