igneous
Quartz with Actinolite or Tourmaline inclusions
Silicon Dioxide (SiO2) with Ca2(Mg,Fe)5Si8O22(OH)2 or Tourmaline group inclusions
Hardness: 6.5 to 7 on Mohs scale. Color: Milky white to light beige matrix with dark green to black acicular needle-like inclusions. Luster: Vitreous to dull earthiness on weathered surfaces. Structure: Trigonal/Hexagonal matrix with monoclinic or trigonal needles.
- Hardness
- 6
- Luster
- Vitreous to dull earthiness on weathered surfaces
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Physical properties
Hardness: 6.5 to 7 on Mohs scale. Color: Milky white to light beige matrix with dark green to black acicular needle-like inclusions. Luster: Vitreous to dull earthiness on weathered surfaces. Structure: Trigonal/Hexagonal matrix with monoclinic or trigonal needles.
Formation & geological history
Formed in pegmatites, hydrothermal veins, or contact metamorphic environments where fluids rich in silica and iron-magnesium minerals crystallized simultaneously.
Uses & applications
Mainly used as display mineral specimens, lapidary artwork, gemstone cabochons, and educational samples.
Geological facts
Needle-like dark inclusions embedded inside quartz are often called tourmalinated quartz or actinolite-in-quartz (sometimes sold commercially as green rutilated quartz).
Field identification & locations
Identify by looking for white to clear crystalline quartz filled with dark green prismatic needle-like crystal sprays. Commonly found in pegmatite-rich regions worldwide such as Brazil, Madagascar, and the USA.
