Sedimentary Or Igneous (Host Environment)

Quartz with Mica/Host Rock

Silicon Dioxide (SiO2) with Phyllosilicates

Shale with Quartz Vein

Argillaceous Shale with Silicon Dioxide Vein

Honey-colored quartz cluster

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

Chalcedony

Cryptocrystalline Quartz (SiO2)

River Stone (likely Siltstone or fine-grained Basalt)

Clastic Sedimentary (Siltstone) or Mafic Igneous (Basalt)

Chalcedony on Matrix

Silicon Dioxide (SiO2)

Quartz-veined Siltstone/Greywacke

Clastic Sedimentary Rock with Quartz Infill (SiO2 vein)

Probable magnetite-bearing rock

Magnetite (Fe₃O₄), possibly in a fine-grained host rock

Calcite

Calcite (calcium carbonate, CaCO₃), likely a massive crystalline specimen

Almandine Garnet

Almandine, Fe3Al2(SiO4)3

Weathered, quartz-rich metamorphic rock (likely schist or gneiss)

Quartz–feldspar–mica schist/gneiss, with surface lichens and iron-oxide staining

Iron-oxide-stained rock, likely limonite/goethite-bearing stone

Limonite (a mixture of hydrated iron oxides, commonly including goethite, FeO(OH)) coating or staining a host rock

Gneiss (Gneissic Granite Pebble)

Metamorphic rock rich in Quartz, Feldspar, and Mica

Fossil shell fragment

Indeterminate molluscan bioclast, likely aragonite or calcite

Chert (Jasper type)

Microcrystalline Quartz (SiO2)

Quartz with Pyrite

Silicon Dioxide (SiO2) with Iron Sulfide (FeS2)

Pyrite-bearing rock

Likely pyrite (FeS₂), possibly with quartz or other sulfide minerals

Quartz Geode (River Cobble)

Silicon Dioxide (SiO2)

Weathered sandstone pebble

Quartz-rich sandstone, likely arkosic or lithic sandstone

Chalcedony (Agate/Chert variety)

Silicon Dioxide (SiO2)

Milky quartz / quartz vein fragment

Quartz, silicon dioxide (SiO₂)

Quartz-Veined Slate or Greenstone

Metamorphic rock with quartz vein (SiO2)

Limestone

Calcium Carbonate (CaCO3)

Limestone (with potential fossil inclusions)

Calcium Carbonate (CaCO3)

Malachite in Host Rock

Malachite - Cu2CO3(OH)2

Tumbled milky quartz

Quartz (silicon dioxide, SiO₂)

Quartz (Crystalline Cluster)

Silicon Dioxide (SiO2)

Rounded granite or granitic gneiss cobble

Granite–gneiss, chiefly quartz, feldspar, and mica

Banded River Pebble (Gneiss or Quartz-Veined Basalt)

Polished River Siltstone or Quartzite Gneiss

Unidentified weathered rock fragments

Likely mixed silicate rocks; specific identification requires testing

Milky Quartz Pebble with Iron Inclusions

Silicon Dioxide (SiO2) with iron oxide impurities

Quartz Vein / Milky Quartz

Silicon Dioxide (SiO2)

Eudialyte in Matrix

Na15Ca6Fe3Zr3Si26O72(OH,Cl,H2O)3

River Stone (Chalcedony/Jasper variety)

Microcrystalline Quartz (SiO2)

Tumbled quartz pebble (probable)

Quartz, silicon dioxide (SiO₂), possibly milky quartz or quartz-rich river stone

Rose quartz

Quartz (silicon dioxide, SiO₂), pink variety

Black Sapphire (Basaltic Blue Sapphire)

Corundum (Al2O3)

Quartz on Host Rock

Silicon Dioxide (SiO2)

Likely weathered schist or gneiss fragment

Micaceous quartz-feldspar metamorphic rock; exact identification requires testing

Sandstone with Ironstone Concretion

Arenite with Hematite/Goethite nodules (Fe2O3 / FeO(OH))

Red Jasper with Quartz

Microcrystalline Quartz (SiO2)

Polished honey calcite (likely)

Calcite, calcium carbonate (CaCO₃)