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Sillimanite from
Helen Beryl Mine (Sweepstakes Beryl; Big Tom claim; Kem claim), Fourmile, Custer District, Custer Co., South Dakota, USA

Mineral Species
Species:Sillimanite
Formula:Al2(SiO4)O
Description
Quality of samples:not specified / average specimens
Confirmation
Validity:Believed Valid
References
References:Staatz, M. H.; Page, L. R.; Norton, J. J.; Wilmarth, V. R. (1963) Exploration for beryllium at the Helen Beryl, Elkhorn, and Tin Mountain pegmatites, Custer County, South Dakota. USGS Prof. Paper 297C.
Data
Mineral Data:Click here to view Sillimanite data
Locality Data:Click here to view Helen Beryl Mine (Sweepstakes Beryl; Big Tom claim; Kem claim), Fourmile, Custer District, Custer Co., South Dakota, USA
Nearest other occurrences of Sillimanite
3.1km (1.9 miles) A Red Spar Mine, Unorganized District, Custer Co., South Dakota, USA
6.6km (4.1 miles) B Silver Dollar Mine, Custer District, Custer Co., South Dakota, USA
6.9km (4.3 miles) C Buster lode (Buster Dike Mica Mine), Custer, Custer District, Custer Co., South Dakota, USA
7.4km (4.6 miles) D Ruby Reef Claims (Ruby Reef; Ruby Reef No. 1), Custer District, Custer Co., South Dakota, USA
12.9km (8.0 miles) E Victory Mine (Victory pegmatite; Victory Mica Mine; Hedman Mine), Custer, Custer District, Custer Co., South Dakota, USA
14.8km (9.2 miles) F Mica King Mine (Lost Bonanza; Cook Mine), Custer District, Custer Co., South Dakota, USA
14.9km (9.3 miles) G Hot Shot mine, Custer, Custer District, Custer Co., South Dakota, USA
15.0km (9.3 miles) H Elkhorn Mine (Tinsley Mine), Custer, Custer District, Custer Co., South Dakota, USA
16.0km (9.9 miles) I Beecher No. 3, Beecher Lode, Custer, Custer District, Custer Co., South Dakota, USA
16.0km (9.9 miles) J Hofert Arcade (Victory No. 1 Prospect), Custer District, Custer Co., South Dakota, USA
16.4km (10.2 miles) K Southern Black Hills Kyanite Mine, Southern Black Hills, Custer Co., South Dakota, USA
16.4km (10.2 miles) L Lucky Strike (Woods Mine), Pringle, Custer District, Custer Co., South Dakota, USA
18.4km (11.4 miles) M Eureka Lode Prospect (Hultz), Custer Co., South Dakota, USA
21.4km (13.3 miles) N U.S. highways 16/385 & State route 87 intersection area, Oreville District, Pennington Co., South Dakota, USA
28.0km (17.4 miles) O Hugo Mine, Keystone, Keystone District, Pennington Co., South Dakota, USA
241.4km (150.0 miles) P Laramie Range Kyanite Occurrence, Laramie Range District, Albany Co., Wyoming, USA
Mineral and/or Locality  
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