Organic Gemstone (Not A Rock Or Mineral In The Traditional Sense, But Bio Mineralized Material)

Rough emerald (beryl) specimens

Emerald, green beryl — Be₃Al₂Si₆O₁₈, colored mainly by chromium and/or vanadium

Tiger's Eye

SiO2 (Silicon Dioxide with Iron Oxide inclusions)

Quartz and amethyst specimens

Quartz (SiO₂), including purple amethyst variety

Smoky Quartz

Silicon Dioxide (SiO2)

Smoky Quartz

Silicon Dioxide (SiO2)

Iron-stained quartz-bearing rock

Quartz (SiO₂), likely with limonite/goethite iron oxides and possibly feldspar

Quartz (Smoky/Clear variety)

Silicon Dioxide (SiO2)

Quartz (Variety: Rock Crystal Cluster)

Silicon Dioxide (SiO2)

Quartz Crystal Point

Silicon Dioxide (SiO2)

Agate (specifically Chalcedony nodule)

Silicon Dioxide (SiO2)

Ammonite fossil in matrix

Fossilized ammonoid cephalopod; likely an ammonite such as Dactylioceras or a related Jurassic taxon

Clear Quartz (Rock Crystal)

Quartz (Silicon Dioxide, SiO2)

Petrified wood

Silicified wood, commonly quartz/chalcedony (SiO₂) replacing wood tissue

Fossiliferous Rock (likely Dinosaur Fossil in Matrix)

Permineralized Vertebrate Fossil (Calcium Carbonate/Silica replaced bone material)

Rhodonite

Rhodonite ((Mn2+,Fe2+,Mg,Ca)SiO3)

Sandstone (with Moss)

Quartz Arenite / Sandstone

Faceted citrine-colored gemstone

Likely citrine (quartz, SiO₂); possibly yellow glass or synthetic gem

Purple amethyst crystal specimen

Amethyst, purple variety of quartz (SiO₂)

Green Jasper

Silicon Dioxide (SiO2) with impurities

Polished mahogany obsidian

Volcanic glass (mostly SiO₂), commonly called mahogany obsidian

Fossilized shell fragment

Likely calcitic or aragonitic bivalve/gastropod shell; exact taxon indeterminate

Turquoise

Hydrous phosphate of copper and aluminium [CuAl6(PO4)4(OH)8·4H2O]

Polished black stone, likely black obsidian

Obsidian, volcanic glass; primarily silica-rich SiO₂ with minor feldspar, iron, and magnesium

Weathered iron-rich pebble

Likely limonite/goethite-bearing rock; exact identification requires testing

Amber / Copal

Succinite (fossilized tree resin)

Polished moss agate pendant

Moss agate, a chalcedony variety of microcrystalline quartz (SiO₂), with green chlorite/actinolite inclusions

Amber

Succinite (fossilized tree resin)

Chalcedony

Cryptocrystalline Quartz (SiO2)

Porphyritic basalt (likely amygdaloidal basalt)

Basalt, a mafic volcanic rock; predominantly plagioclase and pyroxene, commonly with olivine and secondary zeolite/copper minerals

Chert (Gray Chalcedony)

Microcrystalline Quartz (SiO2)

Fossil bone or tooth fragment

Indeterminate fossilized vertebrate bone/tooth; taxonomic identification is not possible from this blurred image

Amber

Fossilized Tree Resin (Amorphous Hydrocarbon)

Quartz

Silicon Dioxide (SiO2)

Green faceted gemstone, likely emerald or synthetic emerald

Beryl, Be₃Al₂Si₆O₁₈, colored green by chromium and/or vanadium; identity cannot be confirmed visually

Fossil Shell

Brachiopod or Mollusk fossil

Massive Quartz

Silicon Dioxide (SiO2)

Polished moss agate (likely dendritic agate)

Chalcedony, microcrystalline quartz (SiO₂), with inclusions of manganese/iron oxides or hornblende

Small metallic-looking rock fragment

Uncertain; possibly galena-bearing ore or mica-rich schist

Turquoise-and-coral silver jewelry brooch

Turquoise: hydrated copper aluminum phosphate, CuAl₆(PO₄)₄(OH)₈·4H₂O; red cabochons appear to be coral, likely set in silver

Red Jasper

SiO2 (Silicon Dioxide with Iron Oxide inclusions)

Fossilized wood (petrified wood), likely silicified

Petrified wood; predominantly microcrystalline quartz (SiO₂) replacing wood tissue

Sandstone

Sandstone (Siliciclastic Sedimentary Rock)