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Coalingite, Magnesite, Serpentine Group


Coalingite : Mg10Fe3+2[(OH)24|CO3] · 2H2O, Magnesite : MgCO3, Serpentine Group : D2[Si2O5](OH)4 + or - nH2O

Photo Copyright © Jennifer N. Wingard  - This image is copyrighted. Unauthorized reproduction prohibited.
Locality: Hunting Hill quarry (Rockville Crushed Stone Quarry; Travilah Quarry; Rockville Quarry; Bardon Stone Quarry), Rockville, Montgomery Co., Maryland, USA
Coalingite on serpentine with small hydromagnesite crystals on left side of photo. This Coalingite specimen consists metallic-looking flakes. Usually the Coalingite at Hunting Hill is fiberous. Collected by J. Wingard 10-04 and in my personal collection. Specimen is approximately 12 cm across.

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