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Online Mineral Museum Archive of Mineral Photographs and Mineral Descriptions from John Betts - Fine Minerals.com and Allminerals.com

   

Biotite from Holmesburg Granite Quarry, Philadelphia, formerly Holmesburg, Pennsylvania

 
Biotite from Holmesburg Granite Quarry, Philadelphia, formerly Holmesburg, Pennsylvania

Biotite from Holmesburg Granite Quarry, Philadelphia, formerly Holmesburg, Pennsylvania

DESCRIPTION:No. 27972
Mineral:Biotite
Locality:Holmesburg Granite Quarry, Philadelphia, formerly Holmesburg, Pennsylvania
Description:Shiny crystals of black biotite mica collected ca. 1920 from an old granite quarry in Holmesburg, now part of Philadelphia. Ex. A. Lincoln Sherk II, MD. (1896-1970)
Overall Size:6x4x1.5 cm
Crystals:3-5 cm
Archived: For reference only

 

 

 

 

 

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