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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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Fluorapophyllite-(K) from
Thurmhofschacht, Himmelfahrt Mine, Freiberg, Mittelsachsen, Saxony, Germany


Locality type:Shaft
Classification
Species:Fluorapophyllite-(K)
Formula:KCa4(Si8O20)(F,OH) · 8H2O
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Fluorapophyllite-(K) data
Locality Data:Click here to view Thurmhofschacht, Himmelfahrt Mine, Freiberg, Mittelsachsen, Saxony, Germany
Data Identifiers
Mindat Occurrence Record ID:342811
Long-form Identifier:1:3:342811:5
GUID (UUID V4):0
Nearest other occurrences of Fluorapophyllite-(K)
56.1km (34.9 miles) ⓘMariánská Skála (Mariánská hora; Marienberg), Ústí nad Labem, Ústí nad Labem District, Ústí nad Labem Region, Czech Republic
60.3km (37.4 miles) ⓘPöhla-Tellerhäuser Mine, Pöhla, Schwarzenberg, Erzgebirgskreis, Saxony, Germany
66.2km (41.1 miles) ⓘSoutěsky quarry (Zautig quarry), Soutěsky (Zautig), Malá Veleň, Děčín District, Ústí nad Labem Region, Czech Republic
77.7km (48.3 miles) ⓘBukovina hill, Líska, Česká Kamenice, Děčín District, Ústí nad Labem Region, Czech Republic
91.2km (56.7 miles) ⓘKřížový vrch quarry, Cvikov, Česká Lípa District, Liberec Region, Czech Republic
References
(1986) Lapis 11 (7/8), 13-60.
 
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