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

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
Small white mineral fragment (Indeterminate; possibly quartz, calcite, or feldspar) — mineral

Small white mineral fragment

Indeterminate; possibly quartz, calcite, or feldspar

mineral
Chert Nodule in Limestone (Chert (Microcrystalline Quartz, SiO2) and Limestone (Calcium Carbonate, CaCO3)) — sedimentary

Chert Nodule in Limestone

Chert (Microcrystalline Quartz, SiO2) and Limestone (Calcium Carbonate, CaCO3)

sedimentary
Black Pebble (Basalt / Chert) (SiO2 (if Chert) or Mafic Igneous Rock (if Basalt)) — igneous

Black Pebble (Basalt / Chert)

SiO2 (if Chert) or Mafic Igneous Rock (if Basalt)

igneous
Banded gneiss (likely orthogneiss or paragneiss) (Gneiss; composition commonly quartz + feldspar + mica, with possible amphibole/biotite) — metamorphic

Banded gneiss (likely orthogneiss or paragneiss)

Gneiss; composition commonly quartz + feldspar + mica, with possible amphibole/biotite

metamorphic
Blue Impression Jasper beads (Impression jasper (microcrystalline quartz/chalcedony), chiefly SiO₂, with iron-oxide and other mineral inclusions) — gemstone

Blue Impression Jasper beads

Impression jasper (microcrystalline quartz/chalcedony), chiefly SiO₂, with iron-oxide and other mineral inclusions

gemstone