Mineral In A Matrix (Likely Quartz Or Feldspar)

Granite (Pink/Potassium-rich)

Pink Granite (contains K-Feldspar, Quartz, and Plagioclase)

Quartz Pebble

Silicon Dioxide (SiO2)

Jasper with Quartz inclusion

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Granite Cobble

Granite (Phaneritic Quartz-Feldspar Felsic Rock)

Green Aventurine

Aventurine Quartz (SiO2 + Fuchsite mica)

Greenstone / Quartzite Pebble

Metamorphosed Quartz-rich Rock

Conglomerate (River Rock Aggregate)

Conglomerate (Lithic-clast conglomerate)

Granite

Phaneritic Plutonic Rock (primarily Quartz, Feldspar, and Mica)

Quartz Pebble

Silicon dioxide (SiO2)

Granite

Phaneritic Acidic Igneous Rock (composed of Quartz, Alkali Feldspar, and Plagioclase)

Quartzite (Iron-stained)

Quartzite (SiO2 with Fe-oxides)

Quartz (likely tumbled or naturally water-worn)

Quartz (SiO₂ - Silicon Dioxide)

Diorite

Diorite (Intermediate intrusive igneous rock)

Milky Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

Yellow Quartz (Citrine Quartz Pebble)

Silicon Dioxide (SiO2)

Pyrite (on Quartz matrix)

Iron Sulfide (FeS2)

Pyrite (on Quartz matrix)

Iron Sulfide (FeS2)

Quartz-veined Siltstone

Siltstone with Quartz (SiO2) veins

Granodiorite (containing Biotite and Quartz)

Granodiorite (Plagioclase-rich phaneritic intrusive rock)

Quartz Vein in Host Rock (Likely Slate or Shale)

Hydrothermal Quartz (SiO2) in Pelitic host rock

Granite Glacial Erratic

Phaneritic Plutonic Felsic Rock (KAlSi3O8 – NaAlSi3O8 – CaAl2Si2O8 – SiO2)

Arkosic Sandstone

Arkose

Granite

Phaneritic intrusive igneous rock (composition: Quartz, Alkali Feldspar, Plagioclase Feldspar)

Granite

Phaneritic Felsic Intrusive Igneous Rock

Diorite

Diorite (Intermediate intrusive igneous rock)

Mica-rich Pegmatite

Pegmatite (rich in Muscovite and Biotite)

Basalt

Basalt (Mafic Extrusive Igneous Rock)

Gneiss

Gneiss (High-grade regional metamorphic rock)

Quartzite

Metamorphic Quartz (SiO2)

Emerald in Schist (Raw/Tumbled)

Beryllium Aluminum Silicate (Be3Al2Si6O18) with Chromium/Vanadium impurities in Mica Schist

Flagstone (Sandstone)

Clastic Sedimentary Rock (composed of quartz and feldspar)

Quartz with inclusions (likely Tourmaline or Biotite)

Silicon Dioxide (SiO2)

Red Brecciated Jasper

Silicon Dioxide (SiO2) with Hematite inclusions

Diorite

Phaneritic Intermediate Plutonic Rock (Diorite)

Fossiliferous Limestone (Crinoidal)

Bioclastic Limestone (predominantly CaCO3)

Unakite

Epidotized Granite (SiO2 with Ca2(Al,Fe)3(SiO4)3(OH))

Quartz (Milky/Yellowish Pebble)

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Citrine Quartz (likely heat-treated)

Silicon Dioxide (SiO2)

Kimberlite with Diamond

Kimberlite (Diamond formula: C)

Coarse Sand Grain / Lithic Fragment

Clastic Sediment (Lithic fragment or Quartz/Feldspar grain)

Amazonite

K(AlSi3O8) - Microcline variant