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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Cassiterite from
Bob Ingersoll Mine, Keystone, Keystone Mining District, Pennington County, South Dakota, USA


04581820017370329283502.jpg
Cassiterite, etc.

Bob Ingersoll Mine, Keystone, Keystone Mining District, Pennington County, South Dakota, USA
04581820017370329283502.jpg
Cassiterite, etc.

Bob Ingersoll Mine, Keystone, Keystone Mining District, Pennington County, South Dakota, USA
00380890017272015727861.jpg
Cassiterite, etc.

Bob Ingersoll Mine, Keystone, Keystone Mining District, Pennington County, South Dakota, USA
Locality type:Mine
Classification
Species:Cassiterite
Formula:SnO2
Confirmation
Validity:Believed Valid
Associated Minerals Based on Photo Data:
Albite1
- var Cleavelandite1
Data
Mineral Data:Click here to view Cassiterite 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:49727
Long-form Identifier:1:3:49727:9
GUID (UUID V4):0
Nearest other occurrences of Cassiterite
2.4km (1.5 miles) ⓘHopeful Occurrence (Goodhope Nos. 1 & 2; Samelias), Pennington County, South Dakota, USA
3.2km (2.0 miles) ⓘHenry Tin Occurrence, Keystone Mining District, Pennington County, South Dakota, USA
3.5km (2.2 miles) ⓘPeerless Mine, Keystone, Keystone Mining District, Pennington County, South Dakota, USA
4.0km (2.5 miles) ⓘOttumwa Lode Occurrence, Unorganized mining district [5], Pennington County, South Dakota, USA
4.4km (2.7 miles) ⓘEtta Mine, Keystone, Keystone Mining District, Pennington County, South Dakota, USA
4.5km (2.8 miles) ⓘNickel Plate Mine, Keystone, Keystone Mining District, Pennington County, South Dakota, USA
4.5km (2.8 miles) ⓘChampion Property Pennington and Smith, Hill City Mining District, Pennington County, South Dakota, USA
5.0km (3.1 miles) ⓘHugo Mine, Keystone, Keystone Mining District, Pennington County, South Dakota, USA
5.2km (3.2 miles) ⓘWhite Cap Mine, Keystone, Keystone Mining District, Pennington County, South Dakota, USA
5.4km (3.4 miles) ⓘGolden Slipper Gold and Silver (Forest City Mine; Empire Gold Mine), Hill City Mining District, Pennington County, South Dakota, USA
References
Rocks & Min.:10:147 & 60:112,116.
 
and/or  
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