Rock Identifier
Quartz or possibly Jasper/Chert. Looks like a tumbled or water-worn stone. (SiO2 (Silicon Dioxide)) — Mineral or Sedimentary (if chert)
Mineral or Sedimentary (if chert)

Quartz or possibly Jasper/Chert. Looks like a tumbled or water-worn stone.

SiO2 (Silicon Dioxide)

AI-generated identification · may be incorrect

Hardness: 7 on Mohs scale, Color: Light green, greyish-green, or yellowish-green, Luster: Vitreous to waxy, Crystal structure: Hexagonal (cryptocrystalline if chert), Cleavage: None (conchoidal fracture), Specific gravity: ~2.65

Identified More mineral or sedimentary (if chert) →
Explore Quartz or possibly Jasper/Chert. Looks like a tumbled or water-worn stone. in the encyclopedia →

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Physical properties

Hardness: 7 on Mohs scale, Color: Light green, greyish-green, or yellowish-green, Luster: Vitreous to waxy, Crystal structure: Hexagonal (cryptocrystalline if chert), Cleavage: None (conchoidal fracture), Specific gravity: ~2.65

Formation & geological history

Forms in a variety of geological environments including igneous, metamorphic, and sedimentary processes. Water-worn appearance suggests it was found in a riverbed, beach, or stream.

Uses & applications

Commonly collected as a curiosity, used in lapidary arts, or sometimes industrial uses if massive.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. Green varieties can sometimes be called prasiolite (rare) or form due to inclusions like chlorite.

Field identification & locations

Identify by its hardness (will scratch glass) and conchoidal fracture. Often found worldwide in many ordinary geological settings.

More like this

Other mineral or sedimentary (if chert) specimens

Rounded pebble (likely quartz-rich sandstone or weathered chert) (Indeterminate from image; possibly quartz (SiO₂)-rich lithic material) — sedimentary

Rounded pebble (likely quartz-rich sandstone or weathered chert)

Indeterminate from image; possibly quartz (SiO₂)-rich lithic material

sedimentary
Small brown pebble, possibly chert or jasper (Undetermined silica-rich pebble; possibly microcrystalline quartz (SiO₂)) — mineral

Small brown pebble, possibly chert or jasper

Undetermined silica-rich pebble; possibly microcrystalline quartz (SiO₂)

mineral
Tumbled quartz-rich pebble, possibly smoky quartz or chert (Quartz (SiO₂), or microcrystalline quartz if chert) — mineral

Tumbled quartz-rich pebble, possibly smoky quartz or chert

Quartz (SiO₂), or microcrystalline quartz if chert

mineral
Weathered iron-rich river pebbles (Likely ferruginous chert or iron-stained siliceous/conglomeratic rock; exact identification is uncertain from the photograph) — sedimentary

Weathered iron-rich river pebbles

Likely ferruginous chert or iron-stained siliceous/conglomeratic rock; exact identification is uncertain from the photograph

sedimentary
Tumbled chalcedony or quartz-rich stone (Microcrystalline quartz, SiO₂; possibly pale chert or chalcedony) — mineral

Tumbled chalcedony or quartz-rich stone

Microcrystalline quartz, SiO₂; possibly pale chert or chalcedony

mineral
Rounded brown pebble, likely weathered basalt or iron-rich chert (Indeterminate; possibly basalt (fine-grained mafic silicate rock) or ferruginous chert) — igneous

Rounded brown pebble, likely weathered basalt or iron-rich chert

Indeterminate; possibly basalt (fine-grained mafic silicate rock) or ferruginous chert

igneous