Man Made Alloy (Metallic)

Likely tumbled or cut quartz/chalcedony fragment

Silicon dioxide (SiO₂), probably microcrystalline quartz or quartz

Boxwork or Septarian Concretion

Septarian nodule / Boxwork weathering

Tumbled milky quartz pebble

Quartz (silicon dioxide, SiO₂), likely milky quartz

Clear quartz sphere

Quartz (silicon dioxide, SiO₂)

Gold Grain

Native Gold (Au)

Polished brown jasper (likely brecciated or orbicular jasper)

Microcrystalline quartz/chalcedony, SiO₂, with iron-oxide and other mineral inclusions

Opalite (likely imitation opal glass)

Man-made opalescent glass; not a natural mineral (often sold as opalite)

Sandstone (with concrete/human-made layer)

Clastic Sedimentary Rock (primarily Quartz/Feldspar grains)

Opalite

Synthetic Glass (Hydrated Crystalline Silicon Dioxide simulation)

Native copper nugget

Native copper (Cu)

Tumbled opalite (likely man-made glass)

Opalite glass; a synthetic opalescent glass, not a natural mineral species

Concrete

Anthropogenic Sedimentary Rock (Hydrated Calcium Silicate)

Silver (Native Element)

Ag (Native Silver), with minor Copper (Cu)

Obsidian (Blue)

Volcanic Glass (SiO2)

Blue Cracked Quartz (Dyed Fire Crackle Quartz)

Silicon Dioxide (SiO2) with synthetic dye

Slag

Metallurgical Slag

Pink Quartz / Sea Glass

Silicon Dioxide (SiO2)

Titanium Aura Quartz (Aura Quartz)

Titanium-coated Silicon Dioxide (SiO2)

Iron-Nickel Meteorite

Siderite (Iron Meteorite), primarily Fe-Ni alloy

Clear quartz crystal (likely)

Quartz, silicon dioxide (SiO₂)

Iron Meteorite (Oxidized)

Iron-Nickel Alloy (Fe, Ni)

Possible iron meteorite

Iron meteorite, likely kamacite–taenite alloy

Copper ore, likely native copper in a host rock

Native copper (Cu), possibly with cuprite/iron-oxide matrix

Native Copper

Native Copper (Cu)

Galena (likely argentiferous galena)

Galena, PbS; commonly cubic or massive lead sulfide, sometimes containing silver

Tumbled milky quartz pebble

Quartz (silicon dioxide, SiO₂)

Diamond / Clear Quartz / Glass paste

Carbon (Diamond) / Silicon Dioxide (Quartz)

Diamond (or Cubic Zirconia)

Carbon (C) or Zirconium Dioxide (ZrO2)

Quartz (likely milky quartz or quartz glass-like fragment)

Quartz, silicon dioxide (SiO₂)

Iron Meteorite

Iron-Nickel Alloy (Kamacite and Taenite)

Native Gold

Gold (Au)

Iron meteorite (probable)

Iron–nickel meteorite, mainly kamacite and taenite (Fe–Ni alloy)

Blue opalite glass (likely man-made)

Opalite glass; a silica-based amorphous glass, not natural opal

Tumbled opalite (likely man-made glass)

Opalite, a trade name for opalescent glass; not natural opal

Rock crystal quartz fragments

Quartz (silicon dioxide, SiO₂)

Cherry Quartz with Rose Quartz

Crystalline Quartz (SiO2) with glass-based synthetic components

Strawberry Quartz

Silicon Dioxide (SiO2) with Hematite/Goethite inclusions

Faceted clear gemstone, likely quartz or glass imitation

Most likely quartz (SiO₂); exact identification requires refractive-index and hardness tests

Black tumbled stone, possibly obsidian

Obsidian (volcanic glass; predominantly SiO₂), identification uncertain from image

Rounded graywacke or sandstone cobble

Lithified clastic sandstone; likely quartz–feldspar–lithic grain aggregate in a silica or calcite matrix

Clear quartz crystal (likely)

Quartz, silicon dioxide (SiO₂)

Polished dendritic agate or jasper

Microcrystalline quartz (SiO₂), likely chalcedony with iron/manganese dendrites