Minerals

Red Sandstone (Iron-stained)

Clastic sedimentary rock (primarily Quartz with Iron Oxides)

Milky quartz

Quartz (silicon dioxide, SiO₂)

Aquamarine in pegmatite

Beryl, Be₃Al₂Si₆O₁₈ (blue-green variety: aquamarine)

Azurite–malachite-bearing quartz or chalcedony

Cu₃(CO₃)₂(OH)₂ azurite with Cu₂CO₃(OH)₂ malachite in SiO₂-rich matrix

Fossilized bone fragment, possibly vertebrate jaw or limb bone

Petrified/fossil bone; taxonomic identification requires microscopy and provenance

Granodiorite

Granodiorite (intermediate plutonic rock)

Likely quartz-rich rock or mineral fragment

Quartz (SiO₂), possibly in a pegmatitic or granitic matrix

Likely quartz-rich mineral fragment

Quartz (SiO₂), possibly iron-stained or included quartz

Quartz with Mineral Inclusions

Silicon Dioxide (SiO2)

Gneiss

Gneiss (quartz-feldspar-biotite gneiss)

Petrified Wood

Silicified wood (Quartz, SiO2)

Gabbro or Diorite with Quartz/Epidote Vein

Intrusive Igneous Rock (Plutonic)

Purple-gray shale or slate fragment

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

Azurite-Malachite (often called Azerite Malachite or Azurmalachite)

Azurite (Cu3(CO3)2(OH)2) and Malachite (Cu2CO3(OH)2)

Not a rock, mineral, or geological specimen

Banded gneiss pebble

Gneiss, composed chiefly of quartz, feldspar, and mica/amphibole

Gneiss (specifically a Granitic Gneiss specimen)

Gneiss (high-grade metamorphic rock primarily composed of Quartz, Feldspar, and Biotite/Amphibole)

Clear quartz crystal (probable)

Quartz, silicon dioxide (SiO₂)

Quartz Pebble

Crystalline Silicon Dioxide (SiO2)

Rounded quartz-rich pebble, likely milky quartz with iron-oxide inclusions

Quartz (SiO₂), possibly with minor chlorite or iron/manganese oxides

Serpentine-rich metamorphic rock

Serpentinite; chiefly antigorite/lizardite/chrysotile, commonly with magnetite and carbonate

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz Pebble (Iron-Stained)

Silicon Dioxide (SiO2)

Eclogite

Eclogite (Omphacite-Garnet rock)

Quartz Pebble (with Dark Volcanic/Sedimentary Inclusion)

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Mahogany Obsidian

Volcanic glass containing Magnetite/Hematite

Quartz with Chlorite or Hornblende inclusions

Silicon dioxide (SiO2) with phyllosilicate or amphibole inclusions

Petrified Wood

Silicified wood (primarily quartz, 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)

Gossan

Iron-rich regolith (mainly Limonite and Goethite, FeO(OH)·nH2O)

Bumblebee Jasper (technically Bumblebee Stone)

Calcite, Aragonite, and Realgar/Orpiment mixture (SiO2 + CaCO3 + As2S3/As2S2)

Fossilized Shark Tooth

Elasmobranchii gen. indet.