Metamorphic Or Sedimentary (With Staining)

Milky Quartz with Iron Staining

Quartz (Silicon Dioxide, SiO2)

Greenschist

Greenschist (composed mainly of chlorite, epidote, actinolite, and albite)

Iron-rich quartzite or weathered ironstone

Quartzite, predominantly SiO₂, with limonite/goethite (FeO(OH)·nH₂O) staining

Weathered quartz-rich cobble (likely quartzite or siliceous sandstone)

Quartzite, predominantly SiO₂; exact identification requires testing

Quartzite with Hematite staining

Metamorphosed Quartz Sandstone (SiO2)

Quartzite River Cobble

Quartzite (primarily SiO2)

Gneiss (with Quartzite and Biotite)

Gneiss containing SiO2 (Quartz), K(Mg,Fe)3AlSi3O10(OH)2 (Biotite), and (K,Na,Ca)AlSi3O8 (Feldspar)

Agate

Silicon Dioxide (Chalcedony), SiO2

Tumbled quartz crystal

Quartz (silicon dioxide, SiO₂)

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Quartzite River Rock

Quartzite ($SiO_2$)

Tumbled blue-gray stone, likely quartzite or chalcedony

Quartz-rich rock; predominantly microcrystalline or granular SiO₂, identification uncertain from image

Gneiss

Gneiss (Metamorphic Rock)

Limestone with Iron Oxide Staining

Sedimentary Rock (Calcite, CaCO3)

Quartz (Milky or Druzy Quartz)

Silicon Dioxide (SiO2)

Slate

Foliated Metamorphic Rock (composed primarily of Quartz, Muscovite, and Illite)

Quartzite with Iron Inclusions

Metamorphosed Quartz Arenite (SiO2)

Yellow quartz pebble

Quartz (SiO₂), likely iron-stained or naturally yellow quartz; exact variety cannot be determined visually

Quartz pebble

Silicon dioxide (SiO2)

Likely weathered quartz-bearing rock (uncertain identification)

Possibly quartz-rich granite or granitic aplite; exact identification requires a clearer, larger image and tests

Agate

Silicon Dioxide (Chalcedony), SiO2

Quartz Pebble

Silicon Dioxide (SiO2)

Tumbled quartz-rich stone, possibly quartzite

Quartzite (mostly SiO₂), visually similar to chert or weathered quartz sandstone

Feldspar-rich Quartzite

Metamorphic Quartz-Feldspar Aggregate (SiO2 + KAlSi3O8)

Polished brecciated jasper

Microcrystalline quartz (SiO₂), commonly with iron oxides and altered volcanic fragments

Weathered brown rock, likely sandstone

Quartz-rich sandstone (composition uncertain from image)

White Quartz Pebble

Silicon Dioxide (SiO2)

Dragon Blood Jasper

Epidote and Pietersite-rich Quartz (SiO2 with inclusions)

Quartz pebble

Quartz (Silicon dioxide, SiO2)

Tumbled garnet-bearing metamorphic rock (probable garnet schist)

Garnet schist; chiefly quartz, mica, feldspar, and almandine garnet (Fe₃Al₂Si₃O₁₂)

Quartz (Milky/Common)

Silicon Dioxide (SiO2)

Banded metamorphic rock, likely gneiss or metasedimentary slate

Quartz–feldspar–mica gneiss (tentative), possibly containing iron-oxide veins

Tumbled Quartz

Silicon Dioxide (SiO2)

Weathered metamorphic rock, likely schist or gneiss

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

Honey-colored quartz cluster

Quartz, silicon dioxide (SiO₂), likely iron-stained or included quartz

Quartz crystal-bearing rock

Quartz (SiO₂), likely a milky/clear quartz vein specimen

Weathered sandstone or quartzite cobble

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

Mica Schist with Iron Staining

Mica Schist

Decorative polished stone tile, likely white marble or limestone

Calcite-rich marble (CaCO₃), possibly veined limestone; exact identification requires testing

Tumbled chalcedony (likely milky quartz)

Microcrystalline quartz, SiO₂; possibly pale agate or quartzite

Iron-stained quartz-rich rock, likely quartzite or silicified sandstone

Quartzite (dominantly SiO₂), with hematite/goethite surface staining