Chapter: Civil : Engineering Geology : Mineralogy

Quartz Group

It is an important rock forming mineral next to feldspar It is a non- metallic efractory mineral

QUARTZ GROUP

It is an important rock forming mineral next to feldspar It is a non- metallic efractory mineral

It is a silicate group

PHYSICAL PROPERTIES OF QUARTZ:

CRYSTAL SYSTEM: Hexagonal HABIT: Crystalline or amorphous

FRACTURE: Conchoidal

HARDNESS: 7

SPECIFIC GRAVITY: 2.65-2.66(LOW)

STREAK: No

TRANSPARENCY: Transparent/semi-transparent/opaque

POLYMORPHISM TRANSFORMATION:

Quartz ,tridymite,crystotallite,melt

COLOURED VARIETIES:

Pure quartz is always colourless and transparent

Presence of impurities the mineral showing colour they

Amethyst: purple or violet

Smoky quartz: shades of grey

Milky quartz: light brown, pure white, opaque

Rose quartz: rose

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Civil : Engineering Geology : Mineralogy : Quartz Group |