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Mcgovernite

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LMB211793

Mcgovernite

Type Locality

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Description
Locality: 
Sterling Mine, Ogdensburg, Sussex County, New Jersey, United States of America
Size Range: 
Small cabinet (7-10 cm)
Size: 
4 × 7 × 4 cm
Description

The Sterling Mine is the type and only known locality for this rather crazy As bearing mineral. It is the mineral species with the largest number of atoms in the unit cell (Paulus B. Moore). Despite the complex structure, the chemistry is remarkably constant from sample to sample (Pete Dunn). The mine closed in 1986. There won’t be any more of this stuff coming out.

This is a very good sample. The mcgovernite spans about 1.5 x 4 cm. The matrix is lean calcite/franklinite/willemite ore (characteristic for mcgovernite). The calcite barely fluoresces except on the top surface, where it is the usual bright red.

I didn’t provide a photo of the back because there is nothing to see!

Weight 8.7 oz. Single item shipping weight about 11.5 oz.

Mineral Data
What's on the rock

Mcgovernite

Formula: 
Mn19Zn3(AsO4)3(AsO3)(SiO4)3(OH)21
Strunz: 
8.BE.45
Hardness: 
0.0
Type Locality: 
Sterling Mine, Sterling Hill, Ogdensburg, Franklin Mining District, Sussex Co., New Jersey, USA
LMB minerals

Seller Information

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Seller's terms and conditions

In addition to the standard terms and conditions, please note the following. Almost all IDs are visual. While in most cases the ID is obvious, there may be cases where it is not. If you are doubtful about a particular ID, please ask for more information. Or do not bid! Similarly, if you are not sure that the specimen meets your criteria, do not bid. I have tdone the best I can with the photos. Nevertheless, if you are not happy with a specimen for any reason, I will refund the bid price – but not the shipping costs (unless the fault is clearly mine) – if the specimen is returned. This policy applies even if analysis of the specimen shows that my ID was incorrect. When in doubt, ask - or don’t bid. Note that most crystals at MSH and Varennes are micros - even if on large specimens. Please pay attention to the stated sizes. Any customs duties, fees etc. are the responsibility of the buyer.

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