mineral
Dendritic Quartz Pebble
Silicon Dioxide (SiO2) with Manganese/Iron oxide inclusions
AI-generated identification · may be incorrectHardness: 7 (Mohs scale); Color: White or clear base with brown, black, or reddish branch-like inclusions; Luster: Vitreous to waxy; Crystal structure: Trigonal; Cleavage: None; Specific gravity: 2.65
- Hardness
- 7 (Mohs scale)
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 7 (Mohs scale); Color: White or clear base with brown, black, or reddish branch-like inclusions; Luster: Vitreous to waxy; Crystal structure: Trigonal; Cleavage: None; Specific gravity: 2.65
Formation & geological history
Formed when mineral-rich water (often manganese or iron) seeps into fine fractures of quartz or agate, depositing oxides in a branching crystalline pattern during cooling or evaporation.
Uses & applications
Used primarily in lapidary work, jewelry making (cabochons), and as a collector's specimen due to its unique patterns.
Geological facts
The 'tree-like' patterns are called dendrites, named after the Greek word 'dendron' for tree. These are not fossils of plants, but inorganic mineral growths.
Field identification & locations
Identify by the characteristic branching patterns and the hardness of the quartz base. Commonly found in riverbeds, glacial deposits, and areas with hydrothermal activity.
