EXERCISES ON MI the spe- to 1. Name one or more diagnostic properties and cific
ID: 152817 • Letter: E
Question
EXERCISES ON MI the spe- to 1. Name one or more diagnostic properties and cific value or information for those properties used 3 differentiate between the following mineral pairs: a. calcite and quartz b. feldspar and quartz c. calcite and feldspar d. pyrite and limonite e. amphibole (hornblende) and pyroxene (augite) f mica and clay minerals g. orthoclase and sodic plagioclase h. calcite and dolomite i. calcic plagioclase and pyroxene (augite) j. biotite and amphibole (hornblende) 2. A mineral with a hardness of 7 appears in two differ- ent forms. One is a six-sided barrel-shaped piece with a pyramid at its top, white in color, and transparent. The other is pink, translucent, has no smooth sidesExplanation / Answer
Property
Calcite
Quartz
Color
Colorless, white and with light shades of red, blue, pink, green, gray, brown and black
White, brown, black and purple
Cleavage
Perfect in directions
Weak in three directions
Hardness on Mho’s scale
3
7
Refractive index
1.49 and 1.66
1.55
Luster
Vitreous to resinous to dull
Glassy to vitreous
Property
Feldspar
Quartz
Color
Light in color like pink, white, tan and gray
Colorless or appears clear
Uses
In tiles and dinnerware
In gemstone and electronic application
Consists
Aluminium and silica ion
Silicon and Oxygen
Hardness
6
7
Property
Feldspar
Calcite
Color
Light color like pink, white, tan and gray
Colorless, white and with light shades of red, blue, pink, green, gray, brown and black
Hardness
6
3
Refractive index
1.51 and 1.52
1.49 and 1.66
Uses
Used inn tiles and dinnerware
Used in construction materials and agricultural soil treatment
Property
Pyrite
Limonite
Color
Brass yellow
Yellowish brown to brown to black
Cleavage
Breaks with conchoidal fracture
Amorphous structure (does not have any cleavage
Moh’s Hardness
6 to 6.5
1 to 5
Uses
Ore of gold
Ore of iron and ocher pigments
Specific Gravity
4.9 to 5.2
2.7 to 4.3
Properties
Hornblende
Augite
Color
Black, dark green and dark brown
Black, brown and dark green
Cleavage
Two directions intersecting at 124 and 56 degrees
Perismatic two directions
Moh’s hardness
5 to 6
5.5 to 6
Specific Gravity
2.9 to 3.5
3.2 to 3.6
Uses
Sometime used industries
No use
Property
Calcite
Quartz
Color
Colorless, white and with light shades of red, blue, pink, green, gray, brown and black
White, brown, black and purple
Cleavage
Perfect in directions
Weak in three directions
Hardness on Mho’s scale
3
7
Refractive index
1.49 and 1.66
1.55
Luster
Vitreous to resinous to dull
Glassy to vitreous
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