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Schorl from
Helen Beryl Mine, Fourmile, Custer Mining District, Custer County, South Dakota, USA


05573900017368105185494.jpg
Schorl

Helen Beryl Mine, Fourmile, Custer Mining District, Custer County, South Dakota, USA
05573900017368105185494.jpg
Schorl

Helen Beryl Mine, Fourmile, Custer Mining District, Custer County, South Dakota, USA
05401750017367135317562.jpg
Schorl

Helen Beryl Mine, Fourmile, Custer Mining District, Custer County, South Dakota, USA
Locality type:Mine
Classification
Species:Schorl
Formula:NaFe32+Al6(Si6O18)(BO3)3(OH)3(OH)
Comments:Occurs in pegmatite.
Confirmation
Validity:Believed Valid
Associated Minerals Based on Photo Data:
Beryl4
Quartz4
Microcline1
Fluorapatite1
Data
Mineral Data:Click here to view Schorl data
Locality Data:Click here to view Helen Beryl Mine, Fourmile, Custer Mining District, Custer County, South Dakota, USA
Data Identifiers
Mindat Occurrence Record ID:68285
Long-form Identifier:1:3:68285:9
GUID (UUID V4):0
Nearest other occurrences of Schorl
1.4km (0.9 miles) ⓘNew York Mine (Westinghouse No. 1 Mine), Custer, Custer Mining District, Custer County, South Dakota, USA
2.2km (1.4 miles) ⓘTip Top Mine, Fourmile, Custer Mining District, Custer County, South Dakota, USA
4.2km (2.6 miles) ⓘTin Mountain Mine, Fourmile, Custer Mining District, Custer County, South Dakota, USA
6.2km (3.8 miles) ⓘRoss Mine, Berne, Custer Mining District, Custer County, South Dakota, USA
6.8km (4.2 miles) ⓘWhite Spar Mica Mine (Westinghouse No. 2 Mine), Custer, Custer Mining District, Custer County, South Dakota, USA
6.9km (4.3 miles) ⓘBuster lode (Buster Dike Mica Mine), Custer, Custer Mining District, Custer County, South Dakota, USA
7.6km (4.7 miles) ⓘSanator area, Custer County, South Dakota, USA
7.8km (4.8 miles) ⓘRte. 85A South, Custer, Custer Mining District, Custer County, South Dakota, USA
8.9km (5.5 miles) ⓘHelicopter mine, Custer Mining District, Custer County, South Dakota, USA
9.1km (5.7 miles) ⓘSoda Spar Pegmatite, Glendale, Keystone Mining District, Pennington County, South Dakota, USA
References
Rocks & Minerals: 60: 117.
Staatz, M. H.
Norton, J. J.
Page, Lincoln R., Stocking, Hobart E., Smith, Harriet B. (1956) Contributions to the geology of uranium and thorium by the United States Geological Survey and Atomic Energy Commission for the United Nations International Conference on Peaceful Uses of Atomic Energy, Geneva, Switzerland, 1955. Professional Paper 300. US Geological Survey doi:10.3133/pp300
Wilmarth, V. R. (1963) Exploration for beryllium at the Helen Beryl, Elkhorn, and Tin Mountain pegmatites, Custer County, South Dakota. USGS Prof. Paper 297C.
 
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