South Dakota · Custer County
Occurrence
Phenacite Prospect
Custer County, South Dakota, United States
Beryllium
Mica
Feldspar
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USGS source ↗
Commodities
Primary
Beryllium, Mica, Feldspar
Commodity type
B
Deposit
Deposit size
N
Workings
Surface
Orebody form
WEDGE-SHAPED DIKE
Materials
Ore minerals
Beryl, Feldspar, Mica
Geology
Host rock
Pegmatite
Associated rock
Pegmatite
Economic & production
Development status
Occurrence
Identification
Deposit ID
10055779
MRDS ID
SD02531
Region
NA
Data score
C
Coordinates
43.63885, -103.58389
References
U.S. BUREAU OF MINES, 1955, BLACK HILLS MINERAL ATLAS, SOUTH DAKOTA: PART 2, BUREAU OF MINES INFORMATION CIRCULAR 7707, P. 165-166