Industrial Byproduct

Sandstone (with biological crust)

Arenite (SiO2 based)

Amber Calcite

Calcium Carbonate (CaCO3)

Jasper

Jasper (Silica/Silicon Dioxide, SiO2)

Copper Ore (likely Malachite or Chrysocolla staining)

Copper Secondary Mineral (e.g., Cu2CO3(OH)2)

Quartz (Iron-stained)

Silicon Dioxide (SiO2)

Sandstone (Quartzose Sandstone)

Clastic Sedimentary Rock - Arenite

Sandstone (Banded)

Clastic Sedimentary Rock (primarily SiO2 with Iron Oxide staining)

Agate (Chert/Chalcedony)

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Diamond (or Cubic Zirconia)

C (Carbon) or ZrO2 (Zirconium Dioxide)

Quartzite

Quartzite (SiO2)

Quartzite

Quartzite (mostly SiO2)

Vesicular Rhyolite

Extrusive igneous rock (high-silica rhyolite)

Sandstone

Arenite

Garnet in Matrix (Schist or Quartz)

Almandine Garnet, Fe3Al2(SiO4)3

Silver (Jewelry Specimen)

Native Silver (Chemical Formula: Ag)

Quartzite

Quartzite

Marble

Recrystallized Calcite / Metamorphosed Limestone (CaCO3)

Quartz Geode Fragment

Silicon Dioxide (SiO2)

Botryoidal Quartz

Silicon Dioxide (SiO2)

Possible basalt or industrial iron-rich slag

Basalt (plagioclase–pyroxene rock); identification uncertain from image

Iron-stained Quartz Vein

Silicon Dioxide (SiO2) with Limonite/Hematite inclusions

Quartzite

Quartzite (SiO2)

Frosted Green Aventurine

Silicon Dioxide (Quartz with Fuchsite inclusions) - SiO2

Rough Diamond

Diamond (Native Carbon, C)

Dark basalt or industrial slag (tentative)

Basalt; predominantly plagioclase and pyroxene, possibly with olivine

Likely sandstone or weathered quartz-rich rock fragment

Quartz-rich sandstone; exact identification is uncertain from the photograph

Polished black stone, possibly obsidian

Volcanic glass (obsidian), chiefly amorphous SiO₂

Diamond in Kimberlite

Diamond in Kimberlite Matrix (Diamond: C, Kimberlite: complex Potassic Peridotite)

Likely metallic meteorite fragment

Undetermined iron meteorite, possibly an iron–nickel alloy (kamacite/taenite)

Concrete / Conglomerate (Man-made)

Artificial Conglomerate (Cementitious Composite)

Dyed Agate Slice

Silicon Dioxide (SiO2) with artificial colorants

Opalite Egg

Synthetic Glass (Simulated Opal)

Iron-rich meteorite candidate

Undetermined; possible stony-iron or iron meteorite, commonly kamacite–taenite alloy

Polymer Clay (Mock Mineral)

Polyvinyl chloride (PVC) with plasticizers and pigment

Note: Item is not a geological specimen

Guitar Components (Steel, Nickel, Plastic, Wood)

Titanium Aura Quartz

Titanium-coated Silicon Dioxide (SiO2)

Asphalt (Bituminous Concrete)

Bituminous mix / Anthropogenic conglomerate

Titanium Aura Quartz

Titanium-coated Silicon Dioxide (SiO2)

Unidentified metallic mineral fragment

Indeterminate; possibly galena, hematite, or a metallic meteorite fragment

Glass Nugget (Tumbled Glass)

Amorphous Silicon Dioxide (SiO2) with additives

Yellow tumbled stone, likely calcite

Calcite (CaCO₃), possibly yellow or honey calcite