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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Riebeckite from
Tilly Foster Iron Mine, Town of Southeast, Putnam County, New York, USA


00248320017363410702374.jpg
Riebeckite, etc.

Tilly Foster Iron Mine, Town of Southeast, Putnam County, New York, USA
07901140017272017239155.jpg
Riebeckite

Tilly Foster Iron Mine, Town of Southeast, Putnam County, New York, USA
07829910017272017257145.jpg
Riebeckite, etc.

Tilly Foster Iron Mine, Town of Southeast, Putnam County, New York, USA
02638790017272017285797.jpg
Riebeckite, etc.

Tilly Foster Iron Mine, Town of Southeast, Putnam County, New York, USA
00248320017363410702374.jpg
Riebeckite, etc.

Tilly Foster Iron Mine, Town of Southeast, Putnam County, New York, USA
07773120017363410706243.jpg
Riebeckite

Tilly Foster Iron Mine, Town of Southeast, Putnam County, New York, USA
04058140017362325029474.jpg
Riebeckite, etc.

Tilly Foster Iron Mine, Town of Southeast, Putnam County, New York, USA
02210930017363410717231.jpg
Riebeckite, etc.

Tilly Foster Iron Mine, Town of Southeast, Putnam County, New York, USA
05558250017363410712542.jpg
Riebeckite, etc.

Tilly Foster Iron Mine, Town of Southeast, Putnam County, New York, USA
07901140017272017239155.jpg
Riebeckite

Tilly Foster Iron Mine, Town of Southeast, Putnam County, New York, USA
02961720017272017307918.jpg
Riebeckite, etc.

Tilly Foster Iron Mine, Town of Southeast, Putnam County, New York, USA
02638790017272017285797.jpg
Riebeckite, etc.

Tilly Foster Iron Mine, Town of Southeast, Putnam County, New York, USA
Locality type:Mine
Classification
Species:Riebeckite
Formula:◻Na2(Fe32+Fe23+)Si8O22(OH)2
Comments:Variety crocidolite reported as lavender-blue, fibrous masses in gneiss.
However, "riebeckite" tested at the New York State Museum from other sites in the Hudson Highlands turned out to be other amphiboles.
Habit:fibrous
Colour:lavender-blue
Confirmation
Validity:Believed Valid
Associated Minerals Based on Photo Data:
Calcite1
Talc1
Chondrodite1
Magnetite1
Data
Mineral Data:Click here to view Riebeckite data
Locality Data:Click here to view Tilly Foster Iron Mine, Town of Southeast, Putnam County, New York, USA
Photo GalleryView Gallery (4 photos)
Data Identifiers
Mindat Occurrence Record ID:100211
Long-form Identifier:1:3:100211:9
GUID (UUID V4):0
References
(Januzzi, 1966, 1989) (Trainer, 1942).
Jensen (1978) Minerals of New York State, 42-43
 
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