Week 1 Minerals

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10 Terms

1
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Muscovite

KAl_2Si_3ALO_10(OH)_2 Perfect basal sheet like cleavage, micaceous, hexagonal. elastic sheet growth. Colourless to pale green/yellow.

<p>KAl_2Si_3ALO_10(OH)_2 Perfect basal sheet like cleavage, micaceous, hexagonal. elastic sheet growth. Colourless to pale green/yellow. </p>
2
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Biotite

K(Mg,Fe)_3Si_3ALO_10(OH)_2 Perfect basal sheet like cleavage, Micaceous, hexogonal elastic sheet growth. Brown to black.

<p>K(Mg,Fe)_3Si_3ALO_10(OH)_2 Perfect basal sheet like cleavage, Micaceous, hexogonal elastic sheet growth. Brown to black. </p>
3
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Potassium Feldspar

KALSI_3O_8 Blocky, cubic like cleavage. NO STRIATIONS. Translucent white to pink. Looks like muscle fibres with raw meat.

<p>KALSI_3O_8 Blocky, cubic like cleavage. NO STRIATIONS. Translucent white to pink. Looks like muscle fibres with raw meat. </p>
4
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Quartz

SiO_2 Harder than gass, cannot be scratched by a knife. Vitreous glass like lustre with poor cleavage. Trigonal crystal growth.

<p>SiO_2 Harder than gass, cannot be scratched by a knife. Vitreous glass like lustre with poor cleavage. Trigonal crystal growth.</p>
5
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Plagioclase

(Na,Ca)(Si,Al)_4O_8 Blocky, nerly cubic cleavage. Striation on cleaved faces. Translucent white to grey to black.

<p>(Na,Ca)(Si,Al)_4O_8 Blocky, nerly cubic cleavage. Striation on cleaved faces. Translucent white to grey to black. </p>
6
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Calcite

CaCO_3 excellent rhombohedral cleavage. Double refraction. Sft, easily scratched. REACTS W HCl.

<p>CaCO_3 excellent rhombohedral cleavage. Double refraction. Sft, easily scratched. REACTS W HCl.</p>
7
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Olivine

(Mg,Fe)_2SiO_4 Usually in granular masses. Rough and gritty. Scratches steel. GREEN .

<p>(Mg,Fe)_2SiO_4 Usually in granular masses. Rough and gritty. Scratches steel. GREEN .</p>
8
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Pyrite

FeS_2 Dense opaque mineral. silver grey to brassy yellow. Metllic lustre. harder than most opaque minerals. Striations often.

<p>FeS_2 Dense opaque mineral. silver grey to brassy yellow. Metllic lustre. harder than most opaque minerals. Striations often. </p>
9
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Hornblende

Ca_2(Mg,Fe,Al)_5(Al,Si)_8O_22(OH)_2 or hydrated calcium ferromagnesian aluminosilicate 56/124 degree cleavage, dark green or brownish black. Vitreous lustre.

<p>Ca_2(Mg,Fe,Al)_5(Al,Si)_8O_22(OH)_2 or hydrated calcium ferromagnesian aluminosilicate 56/124 degree cleavage, dark green or brownish black. Vitreous lustre. </p>
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Diopside

CaMgSi_2O_6 Blockier cleavage, close to 90 degrees. Dark green to brownish black. Vitreous.

<p>CaMgSi_2O_6 Blockier cleavage, close to 90 degrees. Dark green to brownish black. Vitreous.</p>