Commodities
PrimaryNiobium (Columbium), Tantalum, Gemstone, Mica
Commodity typeB
Deposit
Deposit sizeY
Orebody formSILL-LIKE WITH CURVED, IRREGULAR CONTACTS
Materials
Ore mineralsAquamarine, Muscovite, Tantalite
GangueAmblygonite, Biotite, Cassiterite, Cleavelandite, Feldspar, Lepidolite, Phenacite, Quartz, Tourmaline
Geology
Host rockPegmatite
Associated rockAmphibole Schist
StructureAsymmetric And Overturned To West Isoclinal Antiform With N25w, 60ne Axial Plane And N10 Plinge Of The Axis.
Economic & production
Development statusProducer
First production1908
Identification
Deposit ID10066333
MRDS IDTC42488
RegionSA
Data scoreC
Coordinates-18.42114, -41.71253
References
PECORA, W.T., KLEPPER, M.R., LARRABEE, D.M., BARBOSA, A.L.M., AND FRAYHA, RESK, 1950, MICA DEPOSITS IN MINAS GERAIS, BRAZIL: U.S. GEOLOGICAL SURVEY BULLETIN 964-C, P. 205-305.PECORA, W.T., AND BARBOSA, A.L.M., 1944, THE GOLCONDA PEGMATITE MINE, MUNICIPIO OF GOVERNADOR VALADARES, MINAS GERAIS, BRAZIL: U.S. GEOLOGICAL SURVEY UNPUBLISHED REPORT 14P.CIMRIPECORA AND BARBOSA (1944); PECORA AND BARBOSA (1944), PECORA ET AL (1950).