Mineral Based Composite

Heat-Treated Citrine (Amethyst-based)

Quartz (Silicon Dioxide) - SiO2

Milky quartz

Quartz (silicon dioxide, SiO₂)

Inlaid stone ring (likely jasper or agate)

Likely microcrystalline quartz (chalcedony, SiO₂), possibly jasper, with decorative mineral inlays

Basalt

Basalt

Gold Ore in Quartz/Matrix

Native Gold (Au) in Quartz (SiO2) matrix

Quartz-rich breccia or iron-stained quartz vein

Microcrystalline and crystalline quartz (SiO₂) with iron-oxide minerals, possibly limonite/goethite and sulfides

Quartz

Silicon Dioxide (SiO₂)

Gold Ore

Native Gold (Au)

Gold Flake

Native Gold (Au)

Diamond

Carbon (C)

Asphalt (Bituminous Concrete)

Bituminous mix containing aggregates and petroleum-based binder (CnH2n+2)

Possible milky quartz vein or nodule

Quartz (SiO₂), provisionally identified from the visible white translucent material

Gold flakes

Native Gold (Au)

Gold

Native Gold (Au)

Gold-bearing quartz vein in dark host rock

Native gold (Au) with quartz (SiO₂), likely in slate, schist, or altered volcanic rock

Native Gold Nuggets

Native Gold (Au)

Opalite

Synthetic Opalised Glass

Amethyst

SiO2 (Silicon Dioxide)

Granitic Gravel and Soil

Regolith / Alluvial sediment

Fossil Shark Tooth

Odontaspididae (Sand Tiger Shark family)

Orange Tabby (Felis catus)

Felis silvestris catus (variety: Red Mackerel Tabby)

Gold Nugget

Native Gold (Au)

Gold Nugget

Native Gold (Au)

Yellow Topaz

Al2SiO4(F,OH)2

Weathered iron-rich rock fragment

Likely limonite/goethite-bearing rock, possibly altered pyrite or mica schist

Opal

Hydrated silica (SiO2·nH2O)

Sandstone (Ferruginous)

Arenite with Iron oxide staining (SiO2 with Fe2O3)

Blue opalescent glass-like gemstone (possibly imitation opalite)

Likely man-made opalite glass; composition varies, typically silica-based glass

Chert (Flint Pebbles)

Microcrystalline Quartz (SiO2)

Quartz

Quartz (SiO2 - Silicon Dioxide)

Jade (likely Nephrite Jade based on appearance)

Nephrite (a variety of actinolite, Ca2(Mg,Fe)5Si8O22(OH)2)

Gold-bearing quartz sulfide specimen

Native gold (Au) with quartz (SiO₂), likely associated with iron sulfides such as pyrite

Native Gold

Native Gold (Au)

Gold

Native Gold (Au)

Native Silver

Silver (Ag)

Turquoise-style beaded bracelet

Turquoise, hydrated copper–aluminum phosphate: CuAl₆(PO₄)₄(OH)₈·4H₂O; possibly dyed or composite beads

Blue Howlite (Dyed)

Calcium Borosilicate Hydroxide (Ca2B5SiO9(OH)5)

Tumbled Stone

Silicon dioxide / Various silicates

Titanium Aura Quartz

Titanium-coated Silicon Dioxide (SiO2)

Quartz-veined Sandstone

Quartzite-veined Arenite (SiO2)

Crinoid stem fossil

Crinoidea

K2 Stone

Azurite in Granite