Sedimentary And Metamorphic

Gneiss

Gneiss

Ferruginous Quartz (Iron-stained Quartzite)

Silicon Dioxide (SiO2) with iron oxide inclusions

Greenstone / Graywacke

Metagraywacke (Chlorite-grade schistose rock)

Titanium Coated Kyanite (Aura Kyanite)

Aluminosilicate (Al2SiO5) with a Titanium-Niobium vacuum-deposited coating

Gneiss (Granitic Gneiss)

Gneiss (from German Gneis, related to 'spark')

Quartzite

Quartzite (primarily SiO2)

Quartzite River Rock (with Limonite staining)

Quartzite (SiO2)

Mixed River Stones and Minerals

Mixed Silica-rich Stones (Quartz, Agate, Jasper, Sandstone, Dalmation Stone)

Red Jasper (Beach Pebble)

SiO2 (Microcrystalline Quartz with Hematite inclusions)

Brown Jasper / River Pebble

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Petrified Wood

Silicified Wood (primarily SiO2)

Black-and-white jasper

Jasper, microcrystalline quartz (SiO₂), with contrasting white mineral inclusions

Green Aventurine

Silicon Dioxide with Fuchsite (SiO2 + K(Al,Cr)2AlSi3O10(OH)2)

Petrified Wood

Silicified Wood (SiO2)

Pyrite in Quartz Matrix

Iron Disulfide (FeS2) in Silicon Dioxide (SiO2)

Quartzite with Iron Oxide Vein

Metamorphic Quartzite (SiO2 with Hematite/Limonite impurities)

Gneiss

Gneiss (High-grade Regional Metamorphic Rock)

Gneiss

Gneiss (High-grade Regional Metamorphic Rock)

Iron sulfide-rich ore, possibly pyrite-bearing gossan

Likely pyrite (FeS₂) with iron oxides/hydroxides and host rock; exact identification requires testing

Weathered quartz-rich rock, likely milky quartz or quartzite

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

Greenstone / River Siltstone

Metasedimentary Greenstone (Chlorite-rich Siltstone)

Banded Gneiss

Gneiss (Metamorphic rock composed of feldspar, quartz, and mica)

Greenstone / Metagraywacke

Metamorphosed basaltic or sedimentary rock (Complex Silicate)

Green Jasper (Chert)

Microcrystalline Quartz (SiO2) with iron/clay inclusion

Agate

Chalcedony (SiO2) with impurities

Gneiss (Granitic Gneiss)

Gneiss

Schist

Mica Schist (primarily Muscovite or Biotite sheet silicates)

Granitic Gneiss

Gneiss (Granite-derived)

Quartzite

Quartzite (primarily SiO2)

Gneiss (Schistose)

Gneiss

Gneiss

Gneiss

Quartzite (Rounded Pebble)

Quartzite (predominantly SiO2)

Gneiss

Gneiss

Banded Gneiss

Gneiss (High-grade metamorphic rock typically composed of Quartz, Feldspar, and Biotite/Amphiboles)

Gneiss (specifically a Granitic Gneiss)

Gneiss (Composition: Quartz, Feldspar, Mica)

Mica Schist with Iron Staining

Mica Schist

Arkosic Sandstone (or Conglomeritic Sandstone fragment)

Arkose (rich in feldspar)

Coarse Sand Grain / Lithic Fragment

Clastic Sediment (Lithic fragment or Quartz/Feldspar grain)

Gneiss

Gneiss (High-grade regional metamorphic rock)

Almandine Garnet

Almandine, Fe3Al2(SiO4)3

Rough Garnet in Matrix

Almandine Garnet (Fe3Al2Si3O12)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)