metamorphic
Quartz with Magnetite or Schorl inclusion
Silicon Dioxide (SiO2) with Fe3O4 or NaFe3(Al6)(BO3)3Si6O18(OH)4
Hardness: 7 (Quartz) / 5.5-6.5 (Inclusion); Color: White/grey matrix with black inclusion; Luster: Vitreous to greasy; Crystal Structure: Trigonal/Hexagonal; Conchoidal fracture on matrix.
- Hardness
- 7 (Quartz) / 5
- Color
- White/grey matrix with black inclusion
- Luster
- Vitreous to greasy
Identified More metamorphic →
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Physical properties
Hardness: 7 (Quartz) / 5.5-6.5 (Inclusion); Color: White/grey matrix with black inclusion; Luster: Vitreous to greasy; Crystal Structure: Trigonal/Hexagonal; Conchoidal fracture on matrix.
Formation & geological history
Formed in metamorphic environments like quartzite or within hydrothermal veins/pegmatites where cooling silica-rich fluids allowed common minerals to grow alongside metallic or silicate inclusions.
Uses & applications
Primarily for mineral collecting, lapidary work (if the inclusions are aesthetically pleasing), and scientific study of geological conditions.
Geological facts
The black inclusion appears to be a cubic or prismatic crystal, possibly magnetite if magnetic, or Schorl (black tourmaline) if it has striated edges. Quartz is the second most abundant mineral in Earth's continental crust.
Field identification & locations
Identify by testing the black inclusion for magnetism or hardness relative to the quartz. Commonly found in mountainous regions or glacial drift. Collectors look for sharp, well-defined inclusions.
