Vote for your favorite mineral in #MinCup26! - Sphalerite vs. Anorthite
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
Ianapera emerald deposit (Sakalava), Ianapera, Benenitra District, Atsimo-Andrefana, Madagascar


Locality type:Deposit
Classification
Species:'Tourmaline' (not an IMA approved species)
Formula:AD3G6(T6O18)(BO3)3X3Z
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Tourmaline data
Locality Data:Click here to view Ianapera emerald deposit (Sakalava), Ianapera, Benenitra District, Atsimo-Andrefana, Madagascar
Data Identifiers
Mindat Occurrence Record ID:217227
Long-form Identifier:1:3:217227:9
GUID (UUID V4):0
Nearest other occurrences of Tourmaline
40.0km (24.9 miles) ⓘIanakafy (Inanakafy), Ianakafy, Betroka District, Anosy, Madagascar
72.6km (45.1 miles) ⓘAmbatomena Toby, Bekorobo, Betroka District, Anosy, Madagascar
References
Andrianjakavah et al.
Groat, L.A.; Giuliani, G.; Marshall, D.D.; Turner, D. (2008) Emerald deposits and occurrences: A review. Ore Geology Reviews, 34 (1-2). 87-112 doi:10.1016/j.oregeorev.2007.09.003
Andrianjakavah, Prosper Rakotovao, Salvi, Stefano, Béziat, Didier, Rakotondrazafy, Michel, Giuliani, Gaston (2009) Proximal and distal styles of pegmatite-related metasomatic emerald mineralization at Ianapera, southern Madagascar. Mineralium Deposita, 44 (7) 817-835 doi:10.1007/s00126-009-0243-5
 
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