South Dakota · Custer County
Occurrence

Formoso

Custer County, South Dakota, United States
Mica
⌖ Show on mapUSGS source ↗
Commodities
PrimaryMica
Commodity typeN
Deposit
Deposit sizeN
Orebody formNARROW DIKES
Materials
Ore mineralsMica
Geology
Host rockPegmatite
Associated rockPegmatite · Pegmatitic Granite;Pegmatite
StructureCut By Pegmatite Dikes
Economic & production
Development statusOccurrence
Identification
Deposit ID10010790
MRDS IDD004764
RegionNA
Data scoreC
Coordinates43.8419, -103.45862
References
U.S. BUREAU OF MINES, 1955, BLACK HILLS MINERAL ATLAS, SOUTH DAKOTA: PART 2, BUREAU OF MINES INFORMATION CIRCULAR 7707