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Classic Locality

Description Tabs

Franklin Mine, Franklin, Sussex County, New Jersey, United States of America
Crystal Group/Cluster
Size Range: 
Miniature (4.5-7 cm)
3.5 × 6.5 × 3.5 cm

This is a pyroxene. Quick and dirty qualitative EDS (see “Analysis”) suggests hedenbergite rather than augite (or petedunnite). According to the analyst, Zn is much more difficult to detect with his setup than either Mn or Fe. So, while the Zn peak looks lower than Mn, he interprerts the scan as (probably) Fe > Zn > Mn.

Per the analyses published in Dunn’s Franklin and Sterling Hill monograph, hedenbergite at Franklin is generally enhanced in Zn but not in Mn. So the Zn is not a red flag. However  the Mn seems anomalous. Possibly there is solid solution with petedunnite and/or johannsenite (but clearly this is neither of those species).

This specimen was found on the old Trotter dump in the late 1970s. The crystals were freed by etching away calcite with muriatic acid. The back is just a bunch of cleavages (possibly, in part, of another mineral).

The lighting and (upside-down) orientation in the third photo emphasize the “rippled” texture of some of the faces. Interesting – or not – depending on your point of view. The orange/red grains are very poorly formed garnets (proably andradite - but not analyzed). 

Single item (no case) shipping weight 7.4 oz. Note that USPS foreign packet rates recently increased significantly. The quoted rate is good up to a total weight of 8 oz (225 g). For buyers outside the USA, that means that additional items are likely to push the postage into the next “bracket” – an increase of $6 to Canada and $9 to all other destinations. (The “silver lining” is that this allows shipping up to 32 oz - 950g.)

Within the USA, the weight is not as much of a problem. There is a nominal increase of $0.20 for each additional ounce. Above 13 oz, I will use Priority Mail. Up to 16 oz, the “own box” Priority rate is $8.50 (including packing).

Please see my "Shipping Policy" for details. 


Mineral Data
What's on the rock


Group Parent: 
Clinopyroxene Subgroup
5.5 - 6.5
Type Locality: 
Mormorsgruvan, Tunaberg Cu-Co Ore Field, Tunaberg, Nyköping, Södermanland, Sweden
Analysis Report - only: Hedenbergite
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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