Metamorphic Or Sedimentary (With Staining)

Sandstone (Quartzose)

Clastic sedimentary rock (primarily SiO2)

Quartzite Pebble

Quartzite (SiO2) with iron staining

Quartzite (Iron-stained)

Quartzite (SiO2 with Fe2O3 staining)

Polished pink quartzite or jasper

Quartzite, predominantly SiO₂; possibly iron-stained jasper/chalcedony

Iron-stained quartz-rich rock, likely quartzite

Quartzite, predominantly quartz (SiO₂), with iron-oxide staining

Orange Quartz

Silicon Dioxide (SiO2) with iron oxide inclusions

Pale yellow quartz pebble

Quartz, SiO₂; identification is uncertain from the image alone

Tumbled quartz (milky quartz)

Quartz, silicon dioxide (SiO₂)

Quartzite (Iron-stained)

Quartzite (mostly SiO2)

Quartz (Iron-stained)

Silicon Dioxide (SiO2) with Iron Oxide impurities

Smoky Quartz with Iron Inclusions

Silicon Dioxide (SiO2)

Gold in Quartz Ore

Hydrothermal Quartz with native Gold (Au)

Iron-stained quartz pebble (likely quartzite)

Quartz-rich rock, probably quartzite; predominantly silicon dioxide (SiO₂) with iron-oxide staining

Rounded quartz-rich pebble, possibly milky quartz or quartzite

Quartz (SiO₂), or quartzite if the grainy texture is confirmed

Quartz Pebble

Silicon Dioxide (SiO2)

Fossiliferous Limestone

Limestone (CaCO3 with Limonite/Goethite staining)

Iron-stained milky quartz pebble

Quartz (SiO₂), commonly with iron-oxide staining

Weathered iron-rich sandstone or ironstone pebble

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

Sandstone (Iron-stained)

Sandstone (rich in Quartz and Hematite/Limonite coatings)

Weathered sandstone cobble

Quartz-rich sandstone, primarily SiO₂ with clay/iron-oxide cement

Weathered carbonate rock, possibly fossiliferous limestone

Calcite-rich limestone (CaCO₃), tentative identification

Ferruginous Sandstone

Arenite with Iron-Oxide Cement (SiO2 with Fe2O3/FeO(OH))

Ferruginous Sandstone with Concretion

Sandstone (SiO2 dominated with Fe2O3 cement)

Ferruginous Sandstone

Sandstone with Iron Oxide (Limonite/Goethite)

Quartzite River Rock

Metamorphic Quartzite (primarily SiO2)

Quartz (Iron-stained)

Silicon Dioxide (SiO2)

Weathered quartzite or quartz-rich metamorphic rock

Quartzite, predominantly microcrystalline SiO₂, possibly with mica, feldspar, and iron-oxide staining

Quartzite pebble

Quartzite (SiO2 with impurities)

Weathered gneiss or schist specimen

Micaceous quartz–feldspar metamorphic rock; exact identification requires testing

Orange Quartzite (or Ferruginous Quartz)

Quartzite (primarily Silicon Dioxide, SiO2)

Orange Quartzite

Quartzite (primarily SiO2 with hematite or iron oxide inclusions)

Weathered granitic or feldspathic pebble

Likely granite/granodiorite; quartz–feldspar–mica aggregate

Sandstone

Arenite (SiO2 primarily)

Quartz (Iron-Stained Quartz Pebble)

Silicon Dioxide (SiO2)

Iron-stained quartzite or quartz-rich breccia

Quartz (SiO₂), likely with iron oxides/hydroxides such as hematite and limonite

Quartzite Pebble

Metamorphic Quartzite

Jasper / Chert (Iron-stained Quartz)

SiO2 (Silicon Dioxide with Iron Oxide inclusions)

Polished brown chalcedony (likely carnelian or jasper)

Microcrystalline quartz, SiO₂; iron oxides produce the brown coloration

Jasper

Silicon dioxide (SiO2)

Agate (Carnelian-like)

Chalcedony (Silicon Dioxide, SiO2)

Sandstone with Hematite staining

Arenite with Fe2O3 inclusions

Quartzite

Metamorphic rock (SiO2)