Minerals

Quartz Pebble

Silicon dioxide (SiO2)

White Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

White Quartz Pendant

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz pebble

Silicon dioxide (SiO2)

Polished malachite

Malachite, Cu₂CO₃(OH)₂

Milky quartz crystal fragment

Quartz, silicon dioxide (SiO₂)

White Quartz

Silicon Dioxide (SiO2)

Iron-stained milky quartz

Quartz (SiO₂), with reddish-brown iron-oxide staining

Milky quartz

Quartz (SiO₂)

Blue kyanite (probable)

Kyanite, Al₂SiO₅

Tumbled Quartz

Silicon Dioxide (SiO2)

Quartz pebble

Silicon dioxide (SiO2)

Vesicular basalt (lava rock)

Vesicular basalt, composed mainly of plagioclase, pyroxene, and often olivine

White pebble (likely quartz or milky quartz)

Quartz, SiO₂ (tentative identification from the image)

Likely milky quartz, possibly quartz-rich vein rock

Quartz (SiO₂); identification from the image is uncertain

Blue Topaz

Al2SiO4(F,OH)2

Quartz Pebble

Silicon Dioxide (SiO2)

Mixed mineral and rock specimens

Unidentified assortment; visible pieces may include rose quartz, green aventurine, quartz, and a gray crystalline rock, but the image is insufficient for exact identification.

Purple-gray shale or slate fragment

Argillite/slate, chiefly compacted clay minerals with quartz and mica

Petrified Wood

Silicified wood (primarily quartz, SiO2)

Small tan mineral or rock fragment (undetermined)

Unidentified; the image does not provide enough detail for a reliable identification

Small rough mineral or rock fragment (not identifiable from the image)

Undetermined; the specimen is too small and lacks diagnostic visible features for a reliable identification

Granite

Granite, composed chiefly of quartz, feldspar, and mica

Likely pink feldspar-bearing pegmatite

Quartz–feldspar pegmatite, likely containing pink potassium feldspar (KAlSi₃O₈) and quartz (SiO₂)

Milky quartz (rough specimen)

Quartz, silicon dioxide (SiO₂)

Quartz-rich pegmatite, with probable feldspar and mica

Granite/pegmatite assemblage: quartz (SiO₂), feldspar (KAlSi₃O₈–NaAlSi₃O₈–CaAl₂Si₂O₈), and mica

Small iron-stained quartz-rich rock fragment

Likely quartz (SiO₂) with iron-oxide staining; exact identification is uncertain from the image

Granite (Black/Dark Granite countertop background)

Intrusive felsic/intermediate igneous rock (e.g., granodiorite or tonalite)

Polished quartz-rich pebble, possibly milky quartz with a dark mineral band

Quartz (SiO₂), with an unidentified dark inclusion or attached matrix

Milky quartz

Quartz (silicon dioxide, SiO₂)

Dark river-worn stone, likely basalt

Basalt; fine-grained mafic volcanic rock, chiefly plagioclase and pyroxene

Weathered iron-rich rock (likely ironstone or altered basalt)

Probable limonite/goethite-bearing basalt or ironstone; exact identification requires testing

Iron-stained milky quartz vein

Quartz (SiO₂), with iron-oxide/hydroxide staining and minor dark inclusions

Quartz (River Pebble)

Silicon Dioxide (SiO2)

Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

Tumbled serpentine

Serpentinite; chiefly antigorite, lizardite, and/or chrysotile [Mg₃Si₂O₅(OH)₄]

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Chrysocolla

Hydrated copper phyllosilicate, (Cu,Al)2H2Si2O5(OH)4·nH2O