Igneous Rock

Gneiss (Stream-worn Cobble)

Gneiss (Metamorphic rock composed primarily of Quartz, Feldspar, and Mica)

Labradorite

Labradorite (a variety of Plagioclase Feldspar), Na(AlSi3O8) to Ca(Al2Si2O8)

Quartz with Mica Schist (Pegmatite Specimen)

SiO2 (Silicon Dioxide) and Phyllosilicates (Biotite/Muscovite)

Nephrite Jade (or Serpentine)

Nephrite (a variety of amphibole mineral tremolite-actinolite) or Serpentine Group minerals

Sandstone

Quartz Sandstone (predominantly)

Mixed Gemstone Bracelet

Mixed natural minerals and rocks (e.g., Rhodonite, Malachite, Sodalite, Rose Quartz, Black Tourmaline, Quartz/Chalcedony variants)

Granite

Granite (a common rock type, not a single mineral; composed primarily of Quartz, Feldspar (Orthoclase and Plagioclase), and Mica (Biotite and/or Muscovite) and/or Amphibole)

Banded Gneiss (River Rock/Pebble)

Gneiss (specifically a banded variety often found as a river rock)

Gossan (Iron Hat)

Limonitic Gossan (predominantly FeO(OH)·nH2O)

Muscovite Mica

Muscovite (Potassium Aluminum Silicate Hydroxide Fluoride), KAl2(AlSi3O10)(OH,F)2

Sunstone (variety of Feldspar)

Oligoclase Sunstone, Plagioclase Feldspar (Na,Ca)Al(Si,Al)Si2O8

Quartz

Quartz (SiO2 - Silicon Dioxide)

Rutilated Quartz

Quartz (SiO2) with Rutile (TiO2) inclusions

Aventurine

Aventurine Quartz (SiO2 with inclusions)

Veined Limestone (Micrite) with Quartz/Calcite Veins

Calcium Carbonate (CaCO3) with Silicate or Carbonate inclusions

Sandstone

Arenite (SiO2, often with CaCO3 or Fe2O3 cement)

Quartz

Quartz (SiO₂)

Sodalite

Sodalite (Na4Al3Si3O12Cl)

Shale or Slaty Mudstone

Argillaceous sedimentary rock

Garnet Beads

Garnet Group (complex nesosilicates, e.g., Almandine Fe3Al2(SiO4)3)

Granite

Phaneritic Plutonic Felsic Rock (primarily Quartz (SiO2), Alkali Feldspar, and Plagioclase Feldspar)

Sandstone

Arenite (SiO2 dominant)

Drill Core Samples (Varied Lithology)

Multi-lithological core samples (containing potential granite, marble, and phyllite/schist sequence)

Quartz

Quartz (SiO₂ - Silicon Dioxide)

Garnet Schist

Garnetiferous Micaceous Schist

Chert (Jasper/Flint Pebble)

Microcrystalline quartz (SiO2)

Quartz (pebble)

Quartz (SiO₂)

Clear/White Quartz (Rock Crystal)

Quartz (Silicon Dioxide, SiO2)

Gneiss

Gneiss (Metamorphic rock of variable composition, typically SiO2 rich)

Green Aventurine and Clear Quartz

Green Aventurine (Silicon Dioxide - SiO2 with Fuchsite inclusions); Clear Quartz (Silicon Dioxide - SiO2)

Quartz (likely Milky Quartz or Chalcedony)

Quartz (SiO2 - Silicon Dioxide)

Metaconglomerate

Metaconglomerate (Quartzite conglomerate)

Pet Rock (Man-made Quartzite or Granite Cobble)

Silicon dioxide (SiO2) mixture; commonly composed of Quartz, Feldspar, and Mica

Epidote (Unakite variety)

Epidosite (Metasomatic rock containing Ca2(Al,Fe)3(SiO4)3(OH))

Marble

Marble (primarily Calcite, CaCO3 or Dolomite, CaMg(CO3)2)

Quartz Vein in Host Rock (Breccia/Rhyolite)

Silicon Dioxide (SiO2) with matrix

Mixed Quartz and River Pebbles (Stone Collection)

Mixed assortment containing mainly Silicon Dioxide (SiO2)

River Pebbles (Stream-rounded rocks)

Fluvial Detritus (varied mineralogy)

Quartz (Clear Quartz/Rock Crystal)

Silicon Dioxide (SiO2)

Granite Gneiss

Gneiss (derived from granitic protolith)

Green Aventurine (likely)

Silicon dioxide (SiO2) with fuchsitemica inclusions

Serpentine

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