mineral
Dogtooth Calcite (with Hematite Inclusions)
Calcite (CaCO3)
Hardness: 3 on Mohs scale. Color: Reddish-brown to pinkish-tan due to iron oxide inclusions. Luster: Vitreous to pearly. Crystal structure: Trigonal/scalenohedral (scalenohedron crystals resembling canine teeth). Cleavage: Perfect rhombohedral in 3 directions. Specific gravity: 2.71.
- Hardness
- 3 on Mohs scale
- Color
- Reddish-brown to pinkish-tan due to iron oxide inclusions
- Luster
- Vitreous to pearly
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Physical properties
Hardness: 3 on Mohs scale. Color: Reddish-brown to pinkish-tan due to iron oxide inclusions. Luster: Vitreous to pearly. Crystal structure: Trigonal/scalenohedral (scalenohedron crystals resembling canine teeth). Cleavage: Perfect rhombohedral in 3 directions. Specific gravity: 2.71.
Formation & geological history
Formed through hydrothermal precipitation in limestone cavities, fractures, or veins. Iron oxides (hematite or goethite) were incorporated during or after crystal growth, imparting the reddish-brown color.
Uses & applications
Highly valued as display specimens by mineral collectors and used in ornamental decor or metaphysical crystal practices.
Geological facts
The distinctive sharp, pointed crystal form of scalenohedral calcite earned it the common name 'dogtooth spar'. Strong acid like dilute HCl will vigorously effervesce on contact with calcite.
Field identification & locations
Identified by its sharp scalenohedral point crystals ('dogteeth'), low Mohs hardness (can be scratched by a copper penny or steel blade), and strong reaction to acid. Common locations include the UK (Cumbria), Mexico (Santa Eulalia), USA (Missouri, Tri-State region), and China.
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