Löllingite, Albite, Quartz

Specimen ID: HWQ-G39

Mineral(s)
Löllingite : FeAs2
Albite : Na(AlSi3O8)
Quartz : SiO2
Locality
Mindat locality:
Dimensions
8.5cm x 7.5cm x 5cm
Events

Photo added to mindat.org

Crystals of löllingite to 3 cm embedded in albite var. cleavelandite and quartz matrix. Löllingite crystals are rimmed by an unidentified massive black mineral, larger masses of which contain blocky crystals of an unidentified dark brown mineral; see second photo. Original label (Gene Bearss collection) states "misnamed as arsenopyrite but no sulfur found with silver coin test" (see Messageboard discussion about "silver coin test", http://www.mindat.org/forum.php?read,100,338067,338067#msg-338067). Purchased at Maine Mineralogical & Geological Society annual auction, October 2014; Gene Bearss acquired it by trade at the Gorham swap in 1979.
Ed Clopton - 29th October 2014

Photo added to mindat.org

Closeup of two löllingite crystals rimmed by a massive black mineral in albite matrix on the other side of the specimen. Toward the right end of the upper margin of the upper crystal, two dark brown crystals are visible embedded in the black mineral. Both the black mineral and the dark brown mineral are unidentified.
Ed Clopton - 29th October 2014
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