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| GOETHITE |
| Chemical Formula, HFeO2 - FeO(OH)
Crystal System, Orthorombic
Crystal Form, Generally massive, kidnish, fibrous, radial texture and rare mineral.
Hardness, 5 - 5.5 |
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| ARAGONITE |
| Chemical Formula, CaCO3
Crystal System, Orthorombic
Crystal Form, commonly shows twinning, needlish, sometimes get plaquely form. Strong twinning types are needlish, prismatic, fibrous, pisolitic, stalactite and column forms.
Twinning, most generaly pseudo-hegsagonal formed twins, can be observed especially {110} surface hexagon prismas.
Hardness, 3.5-4 |
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| GOLD |
| Chemical Formula, Au
Crystal System, Cubic
Crystal Form, generally disseminate
, rarely oktaedral or cubic crystals
Twinning, on {111} surface common
Hardness, 2.5-3 |
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| AZURITE |
| Chemical Formula, Cu3 (CO3)2 (OH)2
Crsytal System, Monoclinic
Crystal Form, Generally look like plaquely or short prismatic crystali;massive, kidnish
Twinning, rare
Hardness, 3.5 - 4 |
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| HEMATITE |
| Chemical Formula, Fe2O3
Crystal System, Trigonal
Crystal System, generally thin or thick plaquely crystals, romboedral, piramidal and rarely prismatic.
Twinning, Penetration twins is typicial.
Hardness, 5 - 6 |
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| QUARTZ |
| Chemical Formula, SiO2
Crystal System, Hegsagonal
Crystal Form, as hexagon prisms form crystals; prism surfaces have vertical scratch to long side of crystal.
Twinning, Dauphin, Brazil and japan twins are very common..
Hardness, 7 |
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| MALACHITE |
| Chemical Formula, Cu2CO3
Crystal System, Monoclinic
Crystal Form, has very rare and little crystal, generally fibrous and radial, short-long prismatic; mostly massive, kidnish
Twinning, {100} surface normal
Hardness, 3.5 - 4 |
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| CALCITE |
| Chemical Formula, CaCO3
Crystal System, Hegsagonal
Crystal Form, coincide different forms of crystal
Twinning, Common; twins as two different twin laws.First twin surface base pinacoid, as second its romboedral surface.
Hardness, 3 |
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| MANGANITE |
| Chemical Formula, MnO(OH)
Crystal System, Monoclinic
Crystal Form, Prismatic crystals with vertical lines , massive, fibrous, columnar and piecel.
Twinning, { 011} surface as contact or penetration twinning normal
Hardness, 4 |
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| CHROMITE |
| Chemical Formula, FeCr2O4
Crystal System, Cubic
Crystal Form, rare crystals are
octahedral; massive, piecel
Hardness, 5.5 |
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| BARITE |
| Chemical Formula, BaSO4
Crystal System, Orthorombic
Crystal Form, Mostly thin-thick
plaquely crystals, short-long prismatic;
sometimes fibrous or lamellious; piecel
Hardness, 3 - 3.5 |
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| CHALCOPYRITE |
| Chemical Formula, CuFeS2
Crystal System, Tetragonal
Crystal Form, formed as Tetraedral crystals, generally massive
Twinning, {112} and {012} surfaces common
Hardness, 3.5 - 4.0 |
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| CINNOBAR |
| Chemical Formula, HgS
Crystal System, Hegsagonal
Crystal Form, Crystals are romboedral or thick plaquely, also short prismatic, generally massive thin piecely
Twinning, {0001} normal
Hardness, 2.0 - 2.5 |
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| PYRITE |
| Chemical Formula, FeS2
Crystal System, Cubic
Crystal Form, Generally cubic, octahedral, pyriteohedral cyrstal
Twinning, {011} surface sometimes coincide across twins .
Hardness, 6 - 6.5 |
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| GALENITE |
| Chemical Formula, PbS
Crystal System, Cubic
Crystal Form, Cubic, okthoedral crystals; plaquely, massive, partable, piecel, fibrous
Twinning, {111} , {114}, {144} surfaces show penetration and contact twins
Hardness, 2.5 |
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Source : www.mta.gov.tr |
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