Gold Rutilated Quartz

Quartz is a mineral species; hexagonal (trigonal) crystal system; chemical composition SiO2 •
transparent to opaque
rutilated quartz, sagenitic quartz (sometimes called sagenite) – general term referring to transparent quartz (usually rock crystal) containing eye-visible needle-like inclusions, such as golden rutile, or dark tourmaline or actinolite needles; often specified according to the type of inclusions contained – rutilated quartz, tourmalinated quartz, for example; fanciful designations like Cupid’s darts, fleches d’amour, Venus hair stone, Thetis hair stone, and cat’s-fur quartz were also applied to sagenitic quartz.

Identification

Optic Character: DR uniaxial positive or AGG (depending on variety)
Refractive Index: 1.544-1.553 (very constant)
Birefringence: .009 (may not be detectable in aggregate varieties) Dispersion: .013
Specific Gravity: 2.66 (+.03.-.02)
Polish Luster: vitreous Fracture: conchoidal to uneven or granular (in aggregates)
Luster: vitreous
Cleavage: none
Hardness: 7
Toughness: good.

Major Source: Brazil.

Gem Reference Guide, Published by GIA. ISBN 0-87311-019-6

Gemstones of the World, Published by Sterling Publishing Co., Inc NY, ISBN 1-4027-4016-6

Encyclopedia of GEMSTONE, Published by ISHINSHA CO., LTD. ISBN 978-986-251-831-1