Sedimentary Or Metamorphic (Low Grade)

Serpentinite

Serpentinite (complex of Antigorite, Lizardite, and Chrysotile, Mg3Si2O5(OH)4)

Serpentinite

Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4

Waterworn greenstone pebble

Likely serpentinite or chlorite-rich metamorphic rock; exact identification requires testing

River Cobble (likely Metasedimentary)

Metasedimentary Rock / Quartz-rich Sandstone

Greenstone / Greenschist

Greenschist (composed primarily of Chlorite, Epidote, and Actinolite)

Banded Iron Formation (BIF) / Tiger Iron

Ferruginous Chert (primarily Quartz [SiO2] and Hematite/Magnetite [Fe2O3/Fe3O4])

Greenstone

Greenschist (metamorphosed mafic igneous rock)

Anthracite Coal

Anthracite (Carbon)

Limonite Concretion

FeO(OH)·nH2O (Hydrated Iron Oxide)

Milky quartz-bearing rock, possibly quartzite

Quartz (SiO₂), likely in a quartzite or quartz-rich metamorphic matrix

Quartzite pebble

Crystalline silica (SiO2)

Schist (Garnet-Mica Schist)

Garnet-Mica Schist

Rough Ruby (Corundum) in Zoisite Matrix

Al2O3 (Aluminum Oxide) with Ca2Al3(SiO4)3(OH)

Jade

Nephrite (Ca2(Mg,Fe)5Si8O22(OH)2) or Jadeite (NaAlSi2O6)

Jadeite

Jadeite (NaAlSi2O6)

Sapphire

Corundum (Al2O3)

Anthracite Coal

Anthracite

Conglomerate

Conglomerate (clastic sedimentary rock)

Coal (Anthracite or Bituminous)

Carbon (C) with varying hydrocarbon and mineral impurities

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

Quartz (SiO₂), possibly quartzite with limonite/goethite iron oxides

River Quartzite Pebble

Quartzite (primarily SiO2)

Anthracite Coal

Anthracite (Carbon-rich metamorphic coal)

Rough Emerald

Beryl (Be3Al2Si6O18 with Chromium/Vanadium impurities)

Stiped Slate Beach Pebble

Low-grade Metamorphic Slate with Quartz Vein (SiO2 on Phyllosilicate base)

Almandine Garnet in Schist

Almandine Garnet (Fe3Al2(SiO4)3) in Mica Schist

Epidote in Granite Gneiss

Epidote bearing Orthogneiss (Ca2(Al,Fe)3(SiO4)3(OH))

Gravel / Small Pebble

Rock Fragment (Gravel)

Mixed Mineral Collection (with Quartz, Beryl, and host rock)

Silicon Dioxide (Quartz), Be3Al2Si6O18 (Beryl), and associated Schist/Pegmatite

Slate

Slate (a fine-grained, foliated metamorphic rock). Mineral composition: Primarily composed of mica minerals (muscovite, chlorite, sericite) and quartz, with minor amounts of hematite, pyrite, and other accessory minerals.

Anthracite Coal

Anthracite

Leopard jasper (orbicular jasper)

Silicified volcanic rock, chiefly microcrystalline quartz/chalcedony (SiO₂) with feldspar and iron-oxide inclusions

Red Jasper

Red Jasper (SiO2 with Hematite impurities)

Coal (Bituminous)

Bituminous Coal (C)

Nephrite Jade

Nephrite (a variety of the Calcium magnesium iron silicate mineral series Actinolite), Ca2(Mg, Fe)5Si8O22(OH)2

Black Opal

Hydrated Silica (SiO2·nH2O)

Ruby (Corundum)

Aluminium oxide (Al2O3) with Chromium traces

Greenstone / Basalt

Metabasalt (often containing Chlorite, Epidote, and Actinolite)

Siltstone River Rock

Siltstone (composed of silt-sized particles, silicate minerals)

Quartzite with Chlorite

Metamosphosed Quartz Sandstone (SiO2 with (Mg,Fe)3(Si,Al)4O10(OH)2 inclusions)

Bornite

Copper Iron Sulfide (Cu5FeS4)

Limonite (Ochreous Sandstone)

Hydrous ferric oxides (FeO(OH)qnH2O)

Anthracite Coal

Anthracite