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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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Tourmaline from
Aricanga mine, São José da Safira, Minas Gerais, Brazil


08192310017362470521796.jpg
Tourmaline

Aricanga mine, São José da Safira, Minas Gerais, Brazil
04202190017272024356625.jpg
Tourmaline

Aricanga mine, São José da Safira, Minas Gerais, Brazil
02029770017362470534699.jpg
Tourmaline, etc.

Aricanga mine, São José da Safira, Minas Gerais, Brazil
07760680017272024368400.jpg
Tourmaline, etc.

Aricanga mine, São José da Safira, Minas Gerais, Brazil
08192310017362470521796.jpg
Tourmaline

Aricanga mine, São José da Safira, Minas Gerais, Brazil
04202190017272024356625.jpg
Tourmaline

Aricanga mine, São José da Safira, Minas Gerais, Brazil
02029770017362470534699.jpg
Tourmaline, etc.

Aricanga mine, São José da Safira, Minas Gerais, Brazil
06760610017362470532531.jpg
Tourmaline, etc.

Aricanga mine, São José da Safira, Minas Gerais, Brazil
08192310017362470521796.jpg
Tourmaline

Aricanga mine, São José da Safira, Minas Gerais, Brazil
04202190017272024356625.jpg
Tourmaline

Aricanga mine, São José da Safira, Minas Gerais, Brazil
09251590017362470535411.jpg
Tourmaline, etc.

Aricanga mine, São José da Safira, Minas Gerais, Brazil
07760680017272024368400.jpg
Tourmaline, etc.

Aricanga mine, São José da Safira, Minas Gerais, Brazil
Locality type:Mine
Classification
Species:'Tourmaline' (not an IMA approved species)
Formula:AD3G6(T6O18)(BO3)3X3Z
Confirmation
Validity:Believed Valid
Associated Minerals Based on Photo Data:
Quartz2
Data
Mineral Data:Click here to view Tourmaline data
Locality Data:Click here to view Aricanga mine, São José da Safira, Minas Gerais, Brazil
Photo GalleryView Gallery (12 photos)
Data Identifiers
Mindat Occurrence Record ID:38906
Long-form Identifier:1:3:38906:8
GUID (UUID V4):0
Nearest other occurrences of Tourmaline
0.8km (0.5 miles) ⓘCruzeiro mine, São José da Safira, Minas Gerais, Brazil
5.6km (3.5 miles) ⓘPederneira mine, São José da Safira, Minas Gerais, Brazil
32.9km (20.5 miles) ⓘSanta Rosa mine, Itambacuri, Minas Gerais, Brazil
54.7km (34.0 miles) ⓘSantana do Encoberto, São Sebastião do Maranhão, Minas Gerais, Brazil
74.9km (46.6 miles) ⓘFanadinho (Fazenda Rubinho Pimenta claim), Capelinha, Minas Gerais, Brazil
84.9km (52.7 miles) ⓘJoão Firmino claim, Linópolis, Divino das Laranjeiras, Minas Gerais, Brazil
86.5km (53.7 miles) ⓘCórrego Frio mine, Linópolis, Divino das Laranjeiras, Minas Gerais, Brazil
87.9km (54.6 miles) ⓘJaime Pacheco claim, Linópolis, Divino das Laranjeiras, Minas Gerais, Brazil
90.4km (56.2 miles) ⓘJove Lauriano claim, Linópolis, Divino das Laranjeiras, Minas Gerais, Brazil
94.8km (58.9 miles) ⓘRibeirão da Folha, Minas Novas, Minas Gerais, Brazil
References
Guimaraes, D. (1948). Age determination of quartz veins and pegmatites in Brazil. Economic Geology, 43(2), 100-118.
 
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