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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
Redcliff Head (Red Cliff Head), Phillip Island, Bass Coast Shire, Victoria, Australia


06593180017365366898087.jpg
Heulandite Subgroup

Redcliff Head, Phillip Island, Bass Coast Shire, Victoria, Australia
06593180017365366898087.jpg
Heulandite Subgroup

Redcliff Head, Phillip Island, Bass Coast Shire, Victoria, Australia
08716590017272036424997.jpg
Heulandite Subgroup

Redcliff Head, Phillip Island, Bass Coast Shire, Victoria, Australia
Locality type:Headland
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
Data
Mineral Data:Click here to view Heulandite Subgroup data
Locality Data:Click here to view Redcliff Head (Red Cliff Head), Phillip Island, Bass Coast Shire, Victoria, Australia
Data Identifiers
Mindat Occurrence Record ID:89554
Long-form Identifier:1:3:89554:1
GUID (UUID V4):0
Nearest other occurrences of Heulandite Subgroup
0.4km (0.3 miles) ⓘRed Bluff, Phillip Island, Bass Coast Shire, Victoria, Australia
0.9km (0.6 miles) ⓘBerrys Beach, Phillip Island, Bass Coast Shire, Victoria, Australia
1.2km (0.7 miles) ⓘPyramid Rock, Phillip Island, Bass Coast Shire, Victoria, Australia
2.2km (1.4 miles) ⓘHelens Head, Phillip Island, Bass Coast Shire, Victoria, Australia
4.2km (2.6 miles) ⓘSmith Bluff, Phillip Island, Bass Coast Shire, Victoria, Australia
5.5km (3.4 miles) ⓘSunderland Bluff, Phillip Island, Bass Coast Shire, Victoria, Australia
39.3km (24.4 miles) ⓘCape Paterson, Bass Coast Shire, Victoria, Australia
References
Birch, William D. (1988) Zeolites from Phillip Island and Flinders, Victoria [Australia]. The Mineralogical Record, 19 (6) 451-460
 
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