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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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Gismondine-Ca from
S35 motorway tunnel (Kirchdorf tunnel), Kirchdorf, Pernegg an der Mur, Bruck-Mürzzuschlag District, Styria, Austria


00533990017362947309339.jpg
Gismondine-Ca

S35 motorway tunnel, Kirchdorf, Pernegg an der Mur, Bruck-Mürzzuschlag District, Styria, Austria
00533990017362947309339.jpg
Gismondine-Ca

S35 motorway tunnel, Kirchdorf, Pernegg an der Mur, Bruck-Mürzzuschlag District, Styria, Austria
03917540017272731535403.jpg
Gismondine-Ca

S35 motorway tunnel, Kirchdorf, Pernegg an der Mur, Bruck-Mürzzuschlag District, Styria, Austria
Locality type:Tunnel
Classification
Species:Gismondine-Ca
Formula:CaAl2Si2O8 · 4H2O
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Gismondine-Ca data
Locality Data:Click here to view S35 motorway tunnel (Kirchdorf tunnel), Kirchdorf, Pernegg an der Mur, Bruck-Mürzzuschlag District, Styria, Austria
Data Identifiers
Mindat Occurrence Record ID:540444
Long-form Identifier:1:3:540444:5
GUID (UUID V4):0
References
Kolitsch, U. et al. (2008)
 
and/or  
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