igneous
Tumbled orange-brown feldspathic rock, likely granite or weathered syenite
Feldspar-rich granitoid; chiefly K-feldspar and plagioclase with minor quartz and dark biotite/amphibole
AI-generated identification · may be incorrectHardness about 6–7 Mohs; orange-tan, mottled, opaque, with a dull to waxy polished luster. Interlocking crystalline texture is partly obscured by tumbling; no obvious cleavage is visible at this scale.
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Physical properties
Hardness about 6–7 Mohs; orange-tan, mottled, opaque, with a dull to waxy polished luster. Interlocking crystalline texture is partly obscured by tumbling; no obvious cleavage is visible at this scale.
Formation & geological history
An intrusive igneous rock that crystallized slowly from magma deep underground, commonly during Precambrian to Phanerozoic continental crust formation. The orange color likely reflects iron staining or alteration of feldspar.
Uses & applications
Used as decorative stone, landscaping aggregate, countertops, and inexpensive tumbled-stone material; generally little gem value.
Geological facts
The specimen’s rounded shape and glossy surface are mechanically tumbled, not naturally weathered. Dark flecks may be biotite or amphibole, while the orange matrix strongly suggests iron-stained feldspar.
Field identification & locations
Identify by its coarse crystalline appearance, feldspar-rich orange color, hardness, and lack of layering or vesicles; a steel file should barely scratch it. Common in continental shield regions and granite gravel deposits.
