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Hetaerolite & Sussexite

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LMB566482

Hetaerolite & Sussexite

ex Ewald Gerstmann (gerstmannite)
Classic Locality

Description Tabs

Description
Locality: 
Sterling Mine, Ogdensburg, Sussex County, New Jersey, United States of America
Class: 
Crystals on Matrix
Size Range: 
Thumbnail (1-3cm)
Size: 
1.5 × 2.3 × 1.4 cm
Largest Crystal: 
0.13cm
Weight: 
9.00gr
Description

This small specimen features a few lustrous, pseudo-octahedral crystals of hetaerolite to about 1.3 mm on edge – fairly large for the species. The off-white to pinkish fibrous/bladed stuff is sussexite. Also note pointy, yellow, zincite crystals scattered on the hetaerolite. But they are tiny and not very sharply forned. 

FOV in the first pair of photos is 5.0 x 3.6 mm. The next three photos (FOV 2.4 x 3.5 mm) show the same crystals at higher magnification. The growth patterns are characteristic of hetaerolite – this is not franklinite.

The black, lustrous crystals are not easy to photograph. It may be helpful to view these photos in stereo on Mindat under minID 2AP-405.

The matrix is granular franklinite/willemite “red ore”.

Single item (small box) shipping weight 2.4 oz. For shipments outside the USA, up to a total weight of 8 oz (225 g), this could be combined with other small items from this or future auctions for the same postage.  For shipments within the USA, there is a nominal increase of about $0.20 for each additional ounce. Above 13 oz I will use “own box” Priority Mail ($8.75). 

Mineral Data
What's on the rock

Hetaerolite

Formula: 
ZnMn2O4
Strunz: 
4.BB.10
Hardness: 
6.0
Colour: 
Black
Type Locality: 
Passaic pit (Marshall Mine; Passaic Mine), Sterling Hill, Ogdensburg, Franklin Mining District, Sussex Co., New Jersey, USA

Sussexite

Formula: 
Mn2+BO2(OH)
Strunz: 
6.BA.15
Hardness: 
3.0
Streak: 
White
Type Locality: 
Franklin Mine, Franklin, Franklin Mining District, Sussex Co., New Jersey, USA
LMB minerals

Seller Information

Payment options: offline, paypal_wpp, paypal_wps

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.