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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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Fergusonite-(Y) from
Karpniki #3 pegmatite, Krogulec, Gmina Mysłakowice, Karkonosze County, Lower Silesian Voivodeship, Poland


Locality type:Pegmatite
Classification
Species:Fergusonite-(Y)
Formula:YNbO4
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Fergusonite-(Y) data
Locality Data:Click here to view Karpniki #3 pegmatite, Krogulec, Gmina Mysłakowice, Karkonosze County, Lower Silesian Voivodeship, Poland
Data Identifiers
Mindat Occurrence Record ID:1280229
Long-form Identifier:1:3:1280229:8
GUID (UUID V4):0
Nearest other occurrences of Fergusonite-(Y)
0.5km (0.3 miles) ⓘKarpniki #4 pegmatite, Karpniki, Gmina Mysłakowice, Karkonosze County, Lower Silesian Voivodeship, Poland
2.0km (1.3 miles) ⓘKarpniki pegmatite, Karpniki, Gmina Mysłakowice, Karkonosze County, Lower Silesian Voivodeship, Poland
7.1km (4.4 miles) ⓘSosnówka #1 pegmatite, Sosnówka, Gmina Podgórzyn, Karkonosze County, Lower Silesian Voivodeship, Poland
7.2km (4.5 miles) ⓘSosnówka #2 pegmatite, Sosnówka, Gmina Podgórzyn, Karkonosze County, Lower Silesian Voivodeship, Poland
9.5km (5.9 miles) ⓘKopki Hill, Jelenia Góra, Lower Silesian Voivodeship, Poland
13.8km (8.6 miles) ⓘRudzianki pegmatite, Zachełmie, Gmina Podgórzyn, Karkonosze County, Lower Silesian Voivodeship, Poland
19.1km (11.9 miles) ⓘMichałowice granite quarry, Piechowice, Karkonosze County, Lower Silesian Voivodeship, Poland
24.7km (15.4 miles) ⓘSzklarska Poręba Huta granite quarry, Szklarska Poręba, Karkonosze County, Lower Silesian Voivodeship, Poland
25.7km (16.0 miles) ⓘSkalna Brama pegmatite, Szklarska Poręba, Karkonosze County, Lower Silesian Voivodeship, Poland
28.6km (17.8 miles) ⓘKönigstein pegmatite, Szklarska Poręba, Karkonosze County, Lower Silesian Voivodeship, Poland
References
Matyszczak, Witold (2018) Liandratite from Karkonosze pegmatites, Sudetes, Southwestern Poland. Mineralogy and Petrology, 112 (3) 357-370 doi:10.1007/s00710-017-0537-8
 
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