Sedimentary Rock (Possibly Conglomerate Or Breccia With A Quartz Vein)

Coquina or Fossiliferous Sandstone

Fossiliferous Calcarenite (CaCO3 with SiO2 inclusions)

Tumbled quartz-rich rock, likely quartzite or milky quartz with iron-oxide staining

Quartzite (primarily SiO₂), possibly with hematite/goethite staining and minor feldspar or mica

Amethyst (Agate/Chalcedony variety)

Silicon Dioxide (SiO2) with iron impurities

Rose Quartz

Silicon Dioxide (SiO2)

White Quartz (Milky Quartz)

Quartz (Silicon Dioxide, SiO2)

Likely quartz-rich river pebble

Milky quartz or quartz-bearing granitic/gneissic fragment (SiO₂-dominant)

Banded agate or jasper fragment

Microcrystalline quartz, SiO₂ (likely iron-stained chalcedony)

Likely weathered quartz-rich stone

Indeterminate; possibly quartz-bearing granite or milky quartz

Quartz (Smoky/Clear variety)

Silicon Dioxide (SiO2)

Biotite-bearing granite

Granite, composed mainly of quartz (SiO₂), potassium feldspar, plagioclase, and biotite mica

Serpentine Schist with Quartz Vein

Serpentine Schist (a type of Metamorphic rock). The white band is likely Quartz (SiO2).

Quartz (Milky/Iron-stained)

Silicon Dioxide (SiO2)

Quartz Vein / Quartzite

Silicon Dioxide (SiO2)

Banded Sedimentary Rock

Sedimentary rock with mineral veins/banding

Chert with Quartz Veining

Microcrystalline Silica (SiO2)

Demantoid Garnet on Matrix

Demantoid (variety of Andradite Garnet) - Ca3(Fe3+)2(SiO4)3

Quartz Pebble

Silicon Dioxide (SiO2)

Ferruginous Quartz

Silicon Dioxide (SiO2) with Hematite/Goethite inclusions

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Granite with Quartz/Feldspar Vein

Granite

Milky Quartz

Silicon Dioxide (SiO2)

Quartz Vein with Iron Staining

Silicon Dioxide (SiO2)

Vesicular basalt (possibly scoria)

Basalt; chiefly plagioclase feldspar, pyroxene, and often olivine, with volcanic glass

Tiger Iron

Tiger Iron (composite of Tiger's Eye, Red Jasper, and Hematite)

Iron-stained milky quartz

Quartz (SiO₂), mainly massive or vein quartz, with reddish-brown iron-oxide staining and possible minor feldspar or other vein minerals

Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Quartz on Schist

Silicon Dioxide (SiO2) on Foliated Metamorphic Rock

Quartz Vein in Matrix (Gneiss/Schist)

Silicon Dioxide (SiO2) in Metamorphic Rock Matrix

White Quartz Pebbles

Quartz (Silicon Dioxide, SiO2)

Raw gold nugget or gold-bearing quartz

Native gold (Au), possibly with quartz (SiO₂) and iron-oxide staining

Polished black agate slice

Chalcedony (microcrystalline quartz), SiO₂, with iron/manganese staining

Red Jasper (possibly)

Jasper (a variety of Chalcedony, SiO2)

Mica Schist with Vein

Mica Schist

Blue Chalcedony

Silicon Dioxide (SiO2)

Milky quartz

Quartz (SiO₂), commonly massive or vein quartz

Gabbro with Quartz Vein

Gabbro (mafic intrusive igneous rock)

Chert with Quartz Vein

Microcrystalline Quartz (SiO2)

Chert / River Cobble

Microcrystalline Quartz (SiO2)

Quartz (Clear to Smokey)

Silicon Dioxide (SiO2)

Diorite with Quartz contact

Intermediate Phaneritic Igneous Rock (Diorite)

Milky Quartz

Silicon Dioxide (SiO2)