Metamorphic Or Sedimentary (With Staining)

Titanium Quartz (Aura Quartz)

Silicon Dioxide (SiO2) treated with Titanium

Milky Quartz

Silicon Dioxide (SiO2)

Quartz (Milky/Gray variety)

Silicon Dioxide (SiO2)

Magnetite-rich ironstone (probable magnetite ore)

Magnetite, Fe₃O₄, likely in a fine-grained ironstone matrix

Tumbled orange-brown quartz pebble

Likely iron-stained quartz or chalcedony (SiO₂)

Pyrite-bearing rock (likely pyrite schist or pyritized shale)

Pyrite (FeS₂) in a fine-grained schistose or shale matrix

Weathered quartz-bearing rock, possibly calcite vein fragment

Indeterminate; likely quartz (SiO₂) with carbonate minerals such as calcite (CaCO₃)

Small tumbled quartz-like pebble

Likely quartz (SiO₂), possibly iron-stained chalcedony or feldspar

Quartz Pebble

Silicon Dioxide (SiO2)

Quartzite Pebble

Metamorphosed Quartz-rich Sandstone (SiO2)

Weathered sandstone or iron-stained quartzite

Quartz-rich sandstone (SiO₂-dominated), possibly metamorphosed to quartzite

Quartzite Cobble

Quartzite (SiO2)

Weathered banded metamorphic rock, likely gneiss

Banded gneiss; commonly quartz–feldspar–mica assemblage

Tumbled quartz (likely milky quartz)

Quartz, silicon dioxide (SiO₂)

Likely quartz-bearing rock fragment

Quartz (SiO₂), possibly with iron-oxide staining or other mineral inclusions

Fossiliferous limestone (likely crinoidal or shell limestone)

Calcite-rich limestone; predominantly CaCO₃, with visible fossil fragments

Quartz (River Pebble)

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Weathered quartzite pebble

Quartzite, composed predominantly of SiO₂ (quartz)

Banded gneiss

Gneiss, commonly quartz–feldspar–mica assemblage

Quartz fragment

Quartz (silicon dioxide, SiO₂)

Quartz Pebble

Silicon Dioxide (SiO2)

Weathered quartz-rich rock, possibly quartzite or iron-stained quartz

Quartzite (mostly SiO₂), with possible iron-oxide staining and minor feldspar/mica

Quartz-rich sandstone or quartzite fragment

Likely quartz arenite; possibly weakly metamorphosed quartzite (mostly SiO₂)

Milky quartz fragment

Quartz (silicon dioxide, SiO₂)

Ferruginous Quartz

Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions

Quartzite

Quartzite (chiefly SiO2)

Quartz (Iron-Stained)

Silicon Dioxide (SiO2)

Milky Quartz Pebble

Silicon Dioxide (SiO2)

Quartz

Silicon dioxide (SiO2)

Gneiss Pebble

Gneiss (High-grade metamorphic rock)

Almandine Garnet (weathered)

Almandine (Fe3Al2(SiO4)3)

Weathered sandstone or iron-stained quartzite fragment

Quartz-rich sandstone (SiO₂), possibly ferruginous sandstone; exact identification requires testing

Pink quartzite (probable)

Quartzite; predominantly microcrystalline quartz (SiO₂), with iron-oxide impurities

Gneiss (with iron staining)

Gneiss

Banded Quartzite

Quartzite (principally SiO2)

Quartz pebble

Silicon dioxide (SiO2)

Ferruginous Quartz on Ironstone

Silicon Dioxide (SiO2) with Hematite (Fe2O3)

Weathered quartz-rich pebble (tentative)

Likely quartz/chalcedony, SiO₂, possibly iron-stained

Quartz Sand Grain / Micro Crystal

Silicon Dioxide (SiO2)

Rounded brown river pebble, likely sandstone or iron-rich quartzite

Probable ferruginous sandstone; possibly quartzite (SiO₂-rich)