Igneous And Metamorphic Derivative (Weathered)

Blue Sapphire (Tumbled/Polished)

Corundum (Al2O3)

Milky Quartz with inclusions

Silicon Dioxide (SiO2)

Banded Gneiss

Gneiss (Felsic to Mafic Metamorphic Rock)

Tumbled or naturally weathered quartz-rich stone, possibly iron-stained quartz

Quartz (SiO₂), with yellow-brown iron-oxide staining; exact identification is uncertain from the photograph

Weathered quartz-rich rock, possibly granite or gneiss

Granite-like aggregate: quartz (SiO₂), feldspar, and minor dark minerals

Likely weathered metamorphic rock (possibly schist or gneiss)

Indeterminate; probable mica-rich quartz–feldspar metamorphic rock

Weathered quartz-rich pebble

Likely milky quartz (SiO₂), possibly a quartz-rich vein fragment

River Pebble (Granite/Gneiss)

Granitic Pebble (Quartz, Feldspar, Mica composition)

Rounded quartz-rich pebble

Likely granitoid-derived quartz–feldspar rock; exact identification uncertain from image

Quartz-rich rock, likely milky quartz vein material

Quartz (SiO₂), possibly quartzite or quartz-bearing pegmatite

Milky quartz with iron-oxide staining

Quartz, silicon dioxide (SiO₂), with limonite/goethite staining

Milky Quartz Pebble

Silicon Dioxide (SiO2)

Weathered banded metamorphic rock, likely gneiss

Banded gneiss; commonly quartz–feldspar–mica assemblage

Iron-stained quartz-rich rock, possibly weathered granite or quartzite

Uncertain from image; likely quartz (SiO₂) with feldspar and iron-oxide staining

Gravel / Small Pebble

Rock Fragment (Gravel)

Magnetic Sand Grain / Magnetite Pellet

Magnetite (Fe3O4)

Milky Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

Nephrite Jade (Yellow Skin)

Nephrite (Ca2(Mg, Fe)5Si8O22(OH)2)

Tumbled quartz pebble (likely milky quartz or chalcedony)

Quartz, SiO₂; possibly microcrystalline quartz (chalcedony)

Weathered quartz-rich rock, possibly granite or quartzite

Likely quartz–feldspar aggregate; exact identification is uncertain from the photograph

Rounded gray river pebble, likely granite or gneiss

Indeterminate granitic rock; commonly quartz + feldspar + mica, possibly gneissic

Rounded gray pebble, likely quartz-rich granite or gneiss

Indeterminate granitoid; commonly quartz + feldspar + mica

Milky quartz

Quartz (silicon dioxide, SiO₂)

Likely weathered quartz or quartz-rich pebble

Quartz, silicon dioxide (SiO₂)

Greenstone

Greenschist

Weathered quartz-bearing metamorphic rock, likely gneiss or quartzite

Quartz-rich gneiss/quartzite with feldspar, mica, and iron-oxide alteration

Milky quartz with iron-oxide staining

Quartz (SiO₂), likely massive milky quartz; minor limonite/goethite staining

Weathered quartz-bearing metamorphic rock, likely gneiss or schist

Quartz–feldspar–mica rock; exact classification is uncertain from the photograph

Granite or Quartzite Pebble

Eclogite

Eclogite (Omphacite-Garnet rock)

White quartz pebble (possibly milky quartz)

Quartz, SiO₂

Granite

Granite, a coarse-grained felsic intrusive igneous rock composed mainly of quartz, feldspar, and mica

Iron-stained weathered rock

Unknown

Weathered quartz-rich metamorphic rock, possibly gneiss or quartzite

Quartz–feldspar–mica metamorphic aggregate; exact identification requires testing

Polished pink-and-black granite or gneiss

Granite–gneiss, chiefly quartz, feldspar, and biotite/amphibole

Weathered quartz-rich metamorphic rock (probable gneiss or quartzite)

Biotite–quartz–feldspar gneiss, possibly micaceous quartzite

Weathered quartz-rich rock, possibly quartzite or altered granite

Quartz-dominant silicate rock; exact identification requires a fresh surface and tests

Weathered iron-rich rock, possibly goethite/limonite-bearing basalt or ironstone

Indeterminate; likely Fe-oxide/hydroxide-rich silicate rock, dominated by goethite (FeO(OH)) and/or hematite (Fe₂O₃)

Likely polished basalt or iron-rich metamorphic rock

Basaltic rock, chiefly plagioclase and pyroxene; exact identification requires testing

Weathered quartz-rich pebble

Likely granitic or quartz-feldspar rock; exact identification is uncertain from the image

Milky quartz (rough quartz fragment)

Quartz, silicon dioxide (SiO₂)

Milky quartz fragment

Quartz (silicon dioxide, SiO₂)