Classification
|
|
|
Mineral
Classification: |
Oxides |
Strunz 8th
Ed. ID:
|
4/D.01-10 |
|
4 : Oxides & Hydroxides D : Oxides with metal : oxygen =
1:2 (MO2 and related compounds) 01 : Quartz group
|
|
|
Crystal
Data
|
|
|
Crystallography:
|
Trigonal -
Trapezohedral |
Crystal
Habit:
|
As
enantimorphic prismatic crystals; may be morphologically
complex, with over 500 forms noted, to 6 meters and
36 tons; Crystalline - Coarse - Occurs as well-formed coarse sized crystals; Crystalline - Fine - Occurs as well-formed fine sized crystals;
|
Twinning:
|
Very
common, penetration twins on the Dauphiné law, about
[0001], and the Brazil law, with [1120] as contact plane;
contact twins on the Japan law, with [1122] as contact
plane, may be repeated; and several other laws.
|
|
|
Physical
Properties
|
|
|
Cleavage: |
None
or [0110] Indistinct
|
Fracture: |
Conchoidal
|
Tenacity:
|
Brittle
|
Hardness
(Mohs): |
7.0 |
Density:
|
2.60
- 2.65 (g/cm3) |
Luminescence:
|
May
be Triboluminescent;
varies widely due to traces of impurities.
|
Radioactivity:
|
Not
Radioactive |
|
|
Optical
Properties
|
|
|
Color: |
Pale
Yellow, Yellow, Orangish Yellow, Orange |
Transparency: |
Transparent |
Luster: |
Vitreous
to Greasy |
Refractive
Index: |
1.544
- 1.553 Uniaxial (+) |
Birefringence: |
0.0090 |
Dispersion: |
0.013
(low) |
Pleochroism: |
Weak
|
|
|
Occurances
|
|
|
Geological
Setting: |
In
hydrothermal veins, epithermal to alpine; characteristic
of granites and granite pegmatites; in sandstones and
quartzites, less abundant in other rock types; in hydrothermal
metal deposits. Common in carbonate rocks; a residual
mineral in soils and sediments. |
Type
Locality: |
n/a |
Year
Discovered: |
Prehistoric |
View
mineral photos: |
Citrine
Mineral Photos and Locations |
|
|
More
Information
|
|
|
|
Mindat.org
(Citrine) Mindat.org
(Quartz) Webmineral.com
(Quartz) |
|
|
Citrine is the yellow variety of
Quartz, one of the most common minerals on Earth. It
is a member of the Quartz Group that also includes Amethyst
and Ametrine.
It
comes in a variety of colors, from pale yellow to deep orange. The color is due to traces of
ferric iron added to the basic Silicon Dioxide formula.
|