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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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Heulandite Subgroup from
S6 motorway tunnel (Tanzenberg tunnel), Tanzenberg, Kapfenberg, Bruck-Mürzzuschlag District, Styria, Austria


05760560017369132498838.jpg
Heulandite Subgroup, etc.

S6 motorway tunnel, Tanzenberg, Kapfenberg, Bruck-Mürzzuschlag District, Styria, Austria
00496060017369132501696.jpg
Heulandite Subgroup, etc.

S6 motorway tunnel, Tanzenberg, Kapfenberg, Bruck-Mürzzuschlag District, Styria, Austria
08028850017272361244824.jpg
Heulandite Subgroup, etc.

S6 motorway tunnel, Tanzenberg, Kapfenberg, Bruck-Mürzzuschlag District, Styria, Austria
08930300017272023449170.jpg
Heulandite Subgroup, etc.

S6 motorway tunnel, Tanzenberg, Kapfenberg, Bruck-Mürzzuschlag District, Styria, Austria
08028850017272361244824.jpg
Heulandite Subgroup, etc.

S6 motorway tunnel, Tanzenberg, Kapfenberg, Bruck-Mürzzuschlag District, Styria, Austria
08930300017272023449170.jpg
Heulandite Subgroup, etc.

S6 motorway tunnel, Tanzenberg, Kapfenberg, Bruck-Mürzzuschlag District, Styria, Austria
Locality type:Tunnel
Classification
Species:'Heulandite Subgroup' (not an IMA approved species)
Formula:(Na/Ca/K)5-6[Al8-9 Si27-28 O72] · nH2O
Confirmation
Validity:Believed Valid
Associated Minerals Based on Photo Data:
Mordenite8
Calcite5
Ferrierite Subgroup2
Dachiardite-Na1
Data
Mineral Data:Click here to view Heulandite Subgroup data
Locality Data:Click here to view S6 motorway tunnel (Tanzenberg tunnel), Tanzenberg, Kapfenberg, Bruck-Mürzzuschlag District, Styria, Austria
Photo GalleryView Gallery (2 photos)
Data Identifiers
Mindat Occurrence Record ID:267129
Long-form Identifier:1:3:267129:1
GUID (UUID V4):0
Nearest other occurrences of Heulandite Subgroup
8.2km (5.1 miles) ⓘS35 motorway tunnel (Kaltenbach tunnel), Zlatten, Pernegg an der Mur, Bruck-Mürzzuschlag District, Styria, Austria
9.4km (5.8 miles) ⓘS35 motorway tunnel (Kirchdorf tunnel), Kirchdorf, Pernegg an der Mur, Bruck-Mürzzuschlag District, Styria, Austria
54.6km (33.9 miles) ⓘGroßer Ringkogel, Gaal, Murtal District, Styria, Austria
60.7km (37.7 miles) ⓘSauerbrunngraben quarries, Stainz, Deutschlandsberg District, Styria, Austria
62.1km (38.6 miles) ⓘBasalt quarry, Weitendorf, Wildon, Leibnitz District, Styria, Austria
63.9km (39.7 miles) ⓘGneiss quarries, Deutschlandsberg, Deutschlandsberg District, Styria, Austria
66.5km (41.3 miles) ⓘHematite Mine, Waldenstein, Wolfsberg, Wolfsberg District, Carinthia, Austria
67.2km (41.7 miles) ⓘA2 motorway tunnel, Übelskogel, Bad Sankt Leonhard im Lavanttal, Wolfsberg District, Carinthia, Austria
72.1km (44.8 miles) ⓘSpodumene prospect, Brandrücken, Frantschach-Sankt Gertraud, Wolfsberg District, Carinthia, Austria
75.6km (46.9 miles) ⓘSchlarbaum quarry, Klausen, Bad Gleichenberg, Südoststeiermark District, Styria, Austria
References
Postl, W. & Walter, F. (1983)
Exel, Reinhard (1993) Die Mineralien und Erzlagerstätten Österreichs. Eigenverlag R. Exel. p.1-447.
 
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