Metamorphic Or Sedimentary (With Staining)

Milky quartz

Quartz (silicon dioxide, SiO₂)

Weathered, iron-stained metamorphic rock (probable schist or gneiss)

Quartz–feldspar–mica metamorphic rock; exact identification requires a fresh surface and thin-section or mineral tests

Red Quartzite

Metamorphosed Quartz Sandstone (SiO2 with Iron Oxide impurities)

Iron-stained quartz-rich metamorphic rock (probable quartzite or hydrothermal vein rock)

Quartz-dominant rock; chiefly SiO₂, with iron oxides/hydroxides and minor sulfide minerals

Tumbled quartz (likely smoky or iron-stained quartz)

Quartz, silicon dioxide (SiO₂)

Polished purple-and-cream jasper (likely)

Silica-rich microcrystalline quartz/chalcedony, SiO₂, colored by iron/manganese minerals

Gold-bearing Quartz

Auriferous Quartz (SiO2 with Native Gold inclusion)

Quartzite with Iron Staining

Metamorphic Quartz Sandstone

Quartzite Pebble

Metamorphic Quartzite

Quartz (Iron-stained)

Silicon Dioxide (SiO2) with Hematite/Limonite impurities

Iron-Stained Quartz

Silicon Dioxide (SiO2) with Iron Oxide impurities

Sandstone (Ferruginous)

Ferruginous Sandstone (SiO2 with Fe2O3)

Sandstone (with Manganese staining)

Arenite (composed primarily of SiO2)

Red Quartzite

Quartzite (primarily SiO2 with hematite inclusions)

Quartzite

Quartzite (mostly SiO2)

Quartzite with Iron inclusions

Metamorphosed Sandstone (SiO2 with Fe2O3)

Yellow Quartzite

Quartzite (SiO2 with iron oxide inclusions)

Quartzite

Metamorphosed Quartz Sandstone (SiO2)

Quartzite with Iron Inclusions

Quartzite (primarily SiO2)

Milky quartz with iron-oxide staining

Quartz (silicon dioxide, SiO₂)

Weathered sandstone fragment

Quartz-rich sandstone, likely iron-oxide-stained litharenite

Quartzite Pebble

Metamorphosed Quartz Sandstone (SiO2)

Ferruginous Quartz

Silicon Dioxide with Iron Oxide (SiO2 + Fe2O3)

Ferruginous Quartzite (Iron-stained Quartzite)

Quartzite with Iron oxides (FeO(OH) / Fe2O3)

Likely potassium feldspar (orthoclase) fragment

Orthoclase, KAlSi₃O₈ (tentative identification)

Sandstone (with Iron Staining)

Clastic sedimentary rock (primarily Quartz with Limonite/Goethite staining)

Red sandstone (likely iron-stained quartz sandstone)

Quartz arenite to arkosic sandstone; predominantly SiO₂ with iron-oxide coatings (hematite/goethite)

Weathered yellow-brown rock fragment

Indeterminate; possibly iron-stained sandstone or weathered limestone

Chert Nodule (Iron-Stained)

Microcrystalline Quartz (SiO2)

Tumbled jasper (likely brown/yellow jasper)

Microcrystalline quartz, SiO₂, typically with iron-oxide and clay impurities

Tumbled quartz-rich pebble

Quartz (SiO₂), possibly iron-stained or included quartz

Quartz

Quartz (SiO2 - Silicon Dioxide)

Iron-rich metamorphic rock (probable garnet-bearing schist or quartzite)

Garnet–quartz–mica schist/quartzite; composition likely quartz (SiO₂), iron oxides/hydroxides, mica, and possible almandine garnet

Sandstone Pebble (River Rock)

Sandstone (Quartz-rich sedimentary rock with iron oxide staining)

Ferruginous Quartz

Iron-stained Quartz (SiO2 with Fe2O3 impurities)

Weathered quartz-rich rock, possibly milky quartz or quartzite

Quartz (SiO₂), likely in a quartzite or silicified matrix

Weathered granitic gneiss

Quartz–feldspar–mica gneiss; compositionally related to granite

Weathered quartz-rich metamorphic rock, likely quartzite

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

Quartzite with Iron Inclusions

Quartzite (primarily SiO2 with Fe2O3 impurities)

Quartzite Cobble

Metamorphic Quartzite (SiO2)

Tumbled milky quartz

Quartz, SiO₂

Weathered quartz-rich rock, likely quartzite

Quartzite (mostly microcrystalline quartz, SiO₂), possibly weathered quartz vein material