Mineral list 1-2 Flashcards

Question

Cuprite

Answer 1

Cu2O Conchoidal fracture Ruby red to green Lighter colored rock 3.5 hardness Metallic luster Supergene copper mineral found in upper oxidized portions of copper veins Minor ore of copper

Answer 2

ZnO Sub adamantine luster Deep red to orange yellow color Black crystals Orange-yellow streak Higher specific gravity 4.0 hardness Confined to zinc deposits at Franklin and Sterling Hill Associated with franklinite and willemite in calcite Ore of zinc

Answer 3

Fe3O4 Metallic luster Magnetic Iron black color High specific gravity 6.0 hardness Uneven fracture Occurs as thin plates and dendric growths between plates of mica May form large ore bodies through magnetic segregation Disseminated as an accessory through most igneous rocks Important iron ore

Answer 4

(Zn, Fe, Mn)(Fe, Mn)2O4 Metallic luster Iron black color Reddish brown to dark brown streak 5.5 hardness Pink present in rock Confined to zinc deposits enclosed in granular limestone Ore of Zinc and manganese

Answer 5

FeCr2O4 Metallic to sub metallic luster Iron black to brownish black (brown on fracture) 5.0 hardness - Distinguished by submetallic luster - often appears granular with bright green alterations - One of the first minerals to separate from cooling magma Common constituent of peridotites (ultra mafic rocks) and other ultra mafic rocks Only ore of chromium

Answer 6

Fe2O3 Reddish to reddish- brown to black color Light to dark red streak High specific gravity 5.5 hardness Occurs in metamorphic deposits and as accessory minerals in feldspathic igneous rocks such as granite May occur as sublimation from volcanic activity Most important ore of iron for steel manufacture

Answer 7

Al2O3 9.0 Hardness - distinguishing property Uneven fracture Typically barrel shaped Color usually some shade of brown Found in silica deficient, aluminum rich rocks Found in large crystals in Si-poor pegmatites Used to make gemstones ( ruby most valuable - higher in chromium) (Sapphire - Iron and titanium present) Also used as an abrasive

Answer 8

FeTiO3 Metallic luster Iron black color (Distinguishing) Black to brownish red streak 6.0 hardness Uneven fracture Common accessory mineral in igneous and metamorphic rocks May be present in large masses in gabbro, diorites as a product of magmatic segregation intimately associated with magnetite Constituent of black sand Major source of titanium

Answer 9

TiO2 Adamantine to submetallic luster Color – red to reddish-brown to black Streak – pale brown Very small mineral pieces Found in granites, granite pegmatites, gneisses, mica schists, metamorphic limestone, and dolomite May be accessory mineral in the rock or in quartz veins traversing it Found in black sands Used as coating of welding rods Some titanium derived from rutile

Answer 10

SnO2 High specific gravity 6.0-7 hardness Adamantine to submetallic luster Brown or black White streak Original constituent of igneous rocks and pegmatites but more common in high temp hydrothermal veins in or near granitic rocks Principal ore of tin

Answer 11

MnO2 Metallic luster Iron black Veiny 6.0-6.5 hardness When manganese dissolves from crystalline rocks it is redeposited primarily as pyrolusite Primary ore of manganese

Answer 12

(Fe, Mn)Nb2O6 or (Fe, Mn)Ta2O6 High specific gravity 6.0 Hardness Black to brown Dark red to black streak Small rocks Recognized by - dark color with lighter streak In granitic rocks and pegmatites - associated with quartz Source of tantalum and niobium

Answer 13

Mg(OH)2 White to gray color Pearly to vitreous luster Perfect basal cleavage White streak 3.5 hardness Found in recrystallized limestone Minor source of metallic magnesium

Answer 14

MnO(OH) Metallic luster Steel gray to iron-black color Dark brown streak Recognized by its black color and brown streak 5.0 hardness Found with other manganese oxides formed by meteoric waters Can be found in hydrothermal vein deposits, especially those associated with the deposition of manganese minerals Minor ore of manganese

Answer 15

FeO(OH) Dull luster Yellow brown to dark brown color Yellow brown streak 5.0 hardness uneven fracture Typically formed under oxidizing conditions as a weathering product of iron bearing minerals Widespread deposits in bogs and springs Ore of iron

Answer 16

Ba(Mn(2+))(Mn(4+))8O16(OH)4 Conchoidal fracture Iron black - very dark Submetallic luster 4.5 hardness Forms as a secondary mineral through the weathering and alteration of primary manganese minerals like pyrolusite Manganese ore

Answer 17

Al2O3 . nH2O -mixture of diaspore, gibbsite and boehmite Dull to earthy luster White, grey to yellow color Pisolitic character 3.0 hardness Supergene origin commonly produced under subtropical to tropical climatic conditions by prolonged weathering and leaching of silica from aluminum bearing rocks From weathering of clay bearing limestone Ore of aluminum

Answer 18

FeO(OH).nH2O Dull luster Low specific gravity Yellow brown color and streak Earthy fracture 5.0 hardness Forms from the hydration of hematite and magnetite and chemical weathering of other iron rich minerals like olivine, pyroxene and biotite Iron ore and pigment

Answer 19

NaCl Perfect cubic cleavage at 90 degrees Luster - transparent to translucent White or colorless 2.0 hardness Dissolved in waters of springs lakes and seas - deposits formed by gradual evaporation of enclosed basins Source of sodium and chlorine for the manufacture of HCl Used to ice highways Preparation of food

Answer 20

KCl White to red color - more red with impurities More bitter than halite 2.5 hardness formed by gradual evaporations of enclosed basins - one of the last to precipitate - after halite Chief source of potassium which is used in fertilizer

Answer 21

CaF2 Commonly green or blue Can be scratched with knife Vitreous luster Octahedral cleavage - 60 and 120 degrees Common in vugs in dolomite and limestone Found in hydrothermal veins Used to make HFl Can be used in manufacturing of glass, fiberglass, pottery and enamel

Mineral list 1-2 Flashcards

(45 cards)