igneous
Tumbled feldspar-rich stone (possibly larvikite)
Likely feldspar-bearing igneous rock; exact identification is uncertain from the image
AI-generated identification · may be incorrectPolished, rounded pebble with tan-brown and dark gray mottling and a glossy surface. If feldspar-rich, hardness is about 6 on the Mohs scale; mineral grains and cleavage are obscured by tumbling.
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Physical properties
Polished, rounded pebble with tan-brown and dark gray mottling and a glossy surface. If feldspar-rich, hardness is about 6 on the Mohs scale; mineral grains and cleavage are obscured by tumbling.
Formation & geological history
Likely formed by cooling magma and later weathering into a pebble; the image does not establish its age or precise geological setting.
Uses & applications
Tumbled stones are used for collecting, decoration, and jewelry crafts; value is typically modest.
Geological facts
The smooth surface is the result of mechanical tumbling and polishing, not the stone’s natural texture.
Field identification & locations
A photo cannot confirm larvikite or distinguish it reliably from other mottled feldspar-rich rocks. Examine a fresh, untumbled surface for visible crystals and feldspar cleavage; similar rocks occur in many regions.
