Metamorphic Or Sedimentary (With Staining)

Quartzite Pebble (with Iron Inclusions)

Metamorphic Rock (Mainly SiO2)

Iron-rich chert or jasper fragment

Microcrystalline quartz (SiO₂), commonly hematite/goethite-bearing

Jasper-Agate

Silicon Dioxide (SiO2)

Likely weathered quartz-rich rock, possibly smoky quartz or chert

Quartz (SiO₂), though exact identification is uncertain from the photograph

Quartz (Iron-Stained / Ferruginous Quartz)

Silicon Dioxide (SiO2)

Ferruginous Quartz

Quartz (Silicon Dioxide, SiO2) with Iron Oxide Inclusions

Chert (Jasper/Flint variety)

Microcrystalline Quartz (SiO2)

Tumbled quartz crystal (likely smoky or iron-stained quartz)

Quartz, silicon dioxide (SiO₂)

Polished brecciated jasper

Silica-rich microcrystalline quartz/chalcedony (SiO₂), with iron-oxide staining and angular mineral fragments

Dragon Blood Jasper (Dragon Stone / Epidote-Piemontite/Jasper rock)

Epidote with Piemontite / Chalcedony aggregate

Weathered quartz-rich metamorphic rock, likely quartzite

Quartzite; predominantly microcrystalline quartz (SiO₂), with possible feldspar, mica, and iron-oxide staining

Weathered quartzite (probable)

Quartzite; predominantly microcrystalline quartz (SiO₂), with possible iron-oxide staining and mica/clay impurities

Milky quartz-bearing rock, possibly quartzite or quartz vein

Quartz (SiO₂), likely with feldspar and minor iron-oxide inclusions

Blue-gray quartz-bearing rock, likely dumortierite quartz or silicified metamorphic rock

Quartz (SiO₂) with probable dumortierite and iron-oxide inclusions

Quartzite with Iron Inclusions

Quartzite (SiO2) with Hematite/Limonite

Rounded quartz-rich pebble

Likely microcrystalline quartz (chalcedony), possibly a weathered quartz or feldspar pebble

Quartz-bearing rock fragment

Likely milky quartz with iron-oxide staining and possible host-rock minerals; exact identification is uncertain from the image.

Greenstone

Metabasalt (composed of chlorite, epidote, and actinolite)

Quartzite (River Pebble)

Metamorphic Quartz (SiO2)

Quartzite

Metamorphic Quartzite (SiO2)

Quartzite (River Pebble)

Metamorphic Quartzite (SiO2)

Quartzite

Metamorphic Quartzite (SiO2)

Yellow Quartzite (River Pebble)

Metamorphic Quartzite (SiO2)

Weathered rock with a tan mineral vein or inclusion

Indeterminate from the photograph; possibly a quartz- or feldspar-rich vein in dark metamorphic host rock

Quartz-rich rock, likely milky quartz or quartzite

Quartz (SiO₂); probable quartzite if the specimen is a coherent rock

Quartz-rich quartzite or silicified stone

Quartzite; predominantly microcrystalline quartz (SiO₂), with minor iron-oxide staining and possible feldspar/clay impurities

Quartzite Pebble (with Iron Staining)

Quartzite (mainly SiO2)

Sandstone (Ferruginous)

Arenite (Fe-bearing Clastic Sedimentary Rock)

Sandstone (River Cobble)

Clastic sedimentary rock (primarily SiO2)

Quartz

Silicon Dioxide (SiO2)

Quartzite Pebble

SiO2 (Silicon Dioxide)

Yellow Sapphire (Corundum)

Corundum (Aluminum Oxide, Al2O3)

Weathered foliated metamorphic rock, likely schist or phyllite

Micaceous quartz–feldspar schist/phyllite; exact identification requires petrographic or chemical testing

Iron-stained gray chert (flint) pebble

Microcrystalline quartz (SiO₂), likely chert with iron-oxide staining

Quartz-rich rock, likely milky quartz or quartzite

Quartz (SiO₂), possibly quartzite with iron-oxide staining

Quartzite (iron-stained, possibly metaconglomeratic)

Quartzite; predominantly recrystallized quartz (SiO₂) with iron-oxide accessory minerals

Weathered pale-blue rock fragment

Unidentified; the image does not show enough detail for a reliable geological identification

Quartzite pebble

Quartzite (mostly SiO2)

Quartzite Pebble

Quartzite (SiO2)

Tumbled milky quartz pebble

Quartz, silicon dioxide (SiO₂)

Weathered iron-rich sandstone or laterite pebble

Ferruginous sandstone; predominantly quartz (SiO₂) cemented or stained by iron oxides/hydroxides

Sandstone

Arenite (CaCO3/SiO2 cemented quartz)