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Groutite

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MNT126140

Groutite

ex Paul Hanses (Meggen, GER)
Classic Locality

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Description
Locality: 
Bülten-Adenstedt Mine, Ilsede, Peine District, Lower Saxony, Germany
Size Range: 
Small miniature (3-4.5 cm)
Size: 
3.2 × 2 × 0.8 cm
Description

The Buelten-Adenstedt mine yielded the best european (or may be even worldwide) kutnohorite, groutite and ramsdellite specimens during the mining period which ended in 1976 (Emilie shaft). This sample is a real german classic with black lustrous groutite crystal aggregates - at least the specimen was labeled as such by the collector who had collected a small lot of these specimens in a box. I did some XRD analyses of very similar material out of this small lot before and except one specimen (which turned out to be pyrolusite) was confirmed to be groutite. I can´t rule out pyrolusite or ramsdellite though. Very rare stuff nowadays. This specimen was found prior to 1962 at the Kaiser Wilhelm shaft by the late german collector Paul Hanses.

Mineral Data
What's on the rock

Groutite

Formula: 
Mn3+O(OH)
Strunz: 
4.FD.10
Hardness: 
3.5 - 4.0
Type Locality: 
Sagamore Mangan No. 2 pit, Ironton, Cuyuna North Range, Crow Wing Co., Minnesota, USA

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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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