|AllMinerals/JohnBetts-FineMinerals > Online Mineral Museum Photographic Archive > Minerals from Pennsylvania > 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|
|Archived:||For reference only|
|Buy similar:||Minerals from Mid-Atlantic, USA > Mica & other Silicates|
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