Vote for your favorite mineral in #MinCup26! - Sphalerite vs. Anorthite
Both zinc ore Sphalerite and calcium plagioclase feldspar Anorthite have perfect cleavage that will split cleanly if you hit them with a hammer, but only one can claim a larger split of your votes!
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Amblygonite-Montebrasite Series from
Bob Ingersoll Mine, Keystone, Keystone Mining District, Pennington County, South Dakota, USA


08985030017366975528905.jpg
Amblygonite-Montebrasite Series

Bob Ingersoll Mine, Keystone, Keystone Mining District, Pennington County, South Dakota, USA
08985030017366975528905.jpg
Amblygonite-Montebrasite Series

Bob Ingersoll Mine, Keystone, Keystone Mining District, Pennington County, South Dakota, USA
00878320017366975548997.jpg
Amblygonite-Montebrasite Series

Bob Ingersoll Mine, Keystone, Keystone Mining District, Pennington County, South Dakota, USA
Locality type:Mine
Classification
Species:'Amblygonite-Montebrasite Series' (not an IMA approved species)
Comments:Masses up to 6 feet in diameter and one mass 30 feet long by 4 feet accross.
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Amblygonite-Montebrasite Series data
Locality Data:Click here to view Bob Ingersoll Mine, Keystone, Keystone Mining District, Pennington County, South Dakota, USA
Data Identifiers
Mindat Occurrence Record ID:720480
Long-form Identifier:1:3:720480:7
GUID (UUID V4):0
Nearest other occurrences of Amblygonite-Montebrasite Series
7.2km (4.5 miles) ⓘDike Lode, Keystone Mining District, Pennington County, South Dakota, USA
References
Meeves, H.; Harrer, C.M.; Salsbury, M.H.; Konselman, A.S; Shannon, S.S. Jnr. (1966) Reconnaissance of beryllium-bearing pegmatite deposits in six western states: Arizona, Colorado, New Mexico, South Dakota, Utah, and Wyoming. Bureau of Mines Information Circular 8298. United States Department of the Interior 34 pp.p.33 - (Table A-1)
Smith, Arthur E., Fritzsch, Eric (2000) SOUTH DAKOTA. Rocks & Minerals, 75 (3) 156-169 doi:10.1080/00357520009605635
 
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