mineral
Hematoid Quartz
Silicon Dioxide with Iron Oxide (SiO2 + Fe2O3)
Hardness: 7 on Mohs scale; Color: Clear with reddish-orange or brownish inclusions; Luster: Vitreous; Crystal Structure: Trigonal; Cleavage: None (conchoidal fracture).
- Hardness
- 7 on Mohs scale
- Color
- Clear with reddish-orange or brownish inclusions
- Luster
- Vitreous
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Physical properties
Hardness: 7 on Mohs scale; Color: Clear with reddish-orange or brownish inclusions; Luster: Vitreous; Crystal Structure: Trigonal; Cleavage: None (conchoidal fracture).
Formation & geological history
Formed through the crystallization of silica-rich solutions in hydrothermal veins or igneous rocks, where iron oxide (hematite or limonite) is present during the growth process, causing the distinctive red or orange coloring.
Uses & applications
Primarily used as a decorative stone, in jewelry (often tumbled or cabochon cut), and highly valued in the metaphysical and gemstone collecting communities.
Geological facts
Also known as Fire Quartz or Harlequin Quartz, it combines the properties of quartz and hematite. The name 'Hematoid' comes from the Greek word 'haima' for blood, referring to the red iron inclusions.
Field identification & locations
Identify by looking for translucent quartz that contains distinct orange or red clouds, streaks, or specks of iron. Common locations include Brazil, Madagascar, and the United States.
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Sedimentary Sandstone (mostly SiO2 with Fe2O3 tinting)
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Schist
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Metamorphic
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Mineral
Epidote
Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)
metamorphic