metamorphic
Fluorite-Gedrite in Quartz (Schist)
Fluorite (CaF2) with Gedrite in Quartz/Feldspar Matrix
Hardness: 4 (fluorite) to 7 (quartz); Color: Deep purple bands, white/pink matrix, olive green gedrite; Luster: Vitreous to pearly; Crystal structure: Monoclinic (gedrite) and Isometric (fluorite); Cleavage: Perfect octahedral (fluorite); Specific gravity: 3.1-3.3 (fluorite/gedrite mix).
- Hardness
- 4 (fluorite) to 7 (quartz)
- Color
- Deep purple bands, white/pink matrix, olive green gedrite
- Luster
- Vitreous to pearly
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Physical properties
Hardness: 4 (fluorite) to 7 (quartz); Color: Deep purple bands, white/pink matrix, olive green gedrite; Luster: Vitreous to pearly; Crystal structure: Monoclinic (gedrite) and Isometric (fluorite); Cleavage: Perfect octahedral (fluorite); Specific gravity: 3.1-3.3 (fluorite/gedrite mix).
Formation & geological history
Formed through regional metamorphism in schist and pegmatite environments. Many specimens of this specific banded purple fluorite with greenish-brown gedrite crystals originate from the Wilberforce area in Ontario, Canada, formed during the Grenville Orogeny (~1 billion years ago).
Uses & applications
Primary use is as a collector specimen; fluorite is also used as a flux in steel making and in high-clarity optical lenses. Gedrite is of scientific interest to mineralogists.
Geological facts
This specific combination (purple fluorite bands with greenish gedrite) is highly characteristic of the Cardiff Uranium Mine region near Wilberforce. It is famous for its vibrant natural banding and the rare mineral associations found in this geological 'Grenville Province'.
Field identification & locations
Identify in the field by the distinct alternating purple fluorite bands and white silicate matrix, often accompanied by translucent olive-green or brown gedrite crystals. It is most commonly found in Ontario, Canada, within metamorphic skarn-like deposits. Use UV light to check for fluorescence (typically blue).
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