igneous
Tumbled quartz-rich stone, possibly granite or sandstone
Uncertain from image; likely quartz (SiO₂) with iron-oxide and feldspar impurities
AI-generated identification · may be incorrectSmall rounded, polished specimen with a brown granular surface and a pale blue-white reflective area. Quartz hardness is 7 Mohs; luster is vitreous, but the visible texture may indicate feldspar- or iron-rich rock rather than a single crystal.
Identified More igneous →
Explore Tumbled quartz-rich stone, possibly granite or sandstone in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Small rounded, polished specimen with a brown granular surface and a pale blue-white reflective area. Quartz hardness is 7 Mohs; luster is vitreous, but the visible texture may indicate feldspar- or iron-rich rock rather than a single crystal.
Formation & geological history
Likely a naturally weathered and mechanically tumbled fragment; if granite, it formed from slow cooling of silica-rich magma, whereas sandstone formed by cementation of sediment. Geological age cannot be determined visually.
Uses & applications
Primarily a decorative or collectible tumbled stone; quartz-rich material may also be used as aggregate or ornamental stone, but this small specimen has no significant industrial value.
Geological facts
The blue-white patch could be surface polish, quartz, or reflected lighting rather than a distinct mineral. Image-based identification is limited because scale, translucency, and fresh fracture are not visible.
Field identification & locations
Look for visible interlocking quartz and feldspar grains for granite, or rounded sand grains and bedding for sandstone; a glassy streakless surface and hardness near 7 suggest quartz. Commonly sourced from gravel deposits or commercial tumbling mixes.
