Minerals

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General Information

Quartz

Quartz is one of the most abundant minerals in the earths crust and can be found in many different varieties, including: amethyst, aventurine, citrine, tiger eye, rose quarts, jasper and calcedony. Calcedony is a crypto crystaline (a fine internal crystal structure, that doesn't look crystaline) form of quartz. Calcedony has again many variants, including: agate, carnelian, chrysoprase and onyx. Calcedony is a semi-precious gemstone.[1]

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Chemical & Physical Information

Trivial NameQuartz
Chemical NameSilicon Dioxide
Chemical FormulaSiO2
Density2,65 g·cm-3
Molar mass-
Hardness7
Crytal systemRhombohedral
Unit cell?
Crystal habit6-sided prism with 6-sided pyramids as end.
FractureConchoidal
CleavageNone
ColourTransparant
LusterGlass
StreakWhite
OpacityTransparent
SafetySafe
ExtraPiezoelectric
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Photos

Quartz

(4 cm)

Quartz

(2 cm)

Quartz

(7 cm)

Quartz

(5 cm)

Quartz

(3 cm)

Quartz

(3 cm)

Quartz

(1 cm)

Amethyst

(2 cm)

Quartz

(3 cm)

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Sources

[1] Wikipedia

[2] Specimen from my personal collection, photo taken by me.