Magnetic Hematite (Man-made)
Iron Oxide (Fe2O3) with Barium-Strontium Ferrite
mineral
Category
Industrial By Product
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Blue Crackle Quartz (Dyed Fire Agate/Quartz)
Silicon Dioxide (SiO2) with artificial dye treatment
mineral
Opalite
Man-made Glass (Synthetic Opalized Glass)
mineral
Coal
Bituminous or Anthracite coal (carbon-rich sedimentary rock)
sedimentary
Quartzite
Quartzite (SiO2)
metamorphic
Porphyritic Andesite
Andesite (Intermediate Volcanic Rock)
igneous
Quartzite
Quartzite (SiO2)
metamorphic
Ferrous Slag
Fused calcium-iron silicates (Industrial Slag)
Anthropogenic/Industrial byproduct
Cullet Glass (Slag Glass)
Amorphous Silicon Dioxide (Industrial Man-made)
mineraloid
Small dark metallic-looking rock fragment
Undetermined; possibly iron oxide-rich material or a metallic mineral
mineral
Carbonado (Black Diamond)
Carbonado (Polycrystalline Diamond)
mineral
Banded Iron Formation
Banded Iron Formation (BIF)
sedimentary
Quartz Sand
Silicon Dioxide (SiO2)
sedimentary
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Goethite
Goethite (α-FeO(OH))
Mineral
Blue Obsidian (Cullet Glass)
Silicon Dioxide (Amorphous Glass)
mineral
Man-made Metal Pin (Non-geological)
Antimony-Lead Alloy or Zinc/Brass Base with Electroplating
Metal Alloy / Manufactured Artifact
Engineered Quartz Stone
Agglomerated Quartz (SiO2 + Polymer Resin)
mineral-based composite
Goldfish Cracker (Culinary Mimic)
Cibus aurum (Commonly composed of Enriched Wheat Flour and Cheddar Cheese)
Anthropogenic Sedimentary-style Organic Solid
Bowling Ball (Brunswick T-Zone Deep Space)
Polyester resin / Polyurethane polymer
Synthetic (not a natural rock)
Quartzite Pebbles
Quartzite (SiO2)
metamorphic
Potassium-Rich Silicate Clay (inferred from biological context)
Phyllosilicate group (likely Illite or Smectite within surrounding soil substrate)
mineral
Quartzite
Quartzite (primarily SiO2)
metamorphic
Garnet
Garnet group (X3Y2(SiO4)3)
mineral
Desert Rose (Gypsum Variety)
Gypsum (Calcium Sulfate Dihydrate) - CaSO4·2H2O
mineral
Granite Pegmatite
Coarse-grained Granite (SiO2 - Aluminum and Alkalies)
igneous
![Schist (Mica Schist (formula variable based on mineral content, typically containing [K,Al,Fe,Mg,Si,O,H])) — metamorphic](https://media.rockidentification.com/82921e91-3bee-4a52-8b94-97f62233f834-thumbnail.jpg)
Schist
Mica Schist (formula variable based on mineral content, typically containing [K,Al,Fe,Mg,Si,O,H])
metamorphic
Silicon Carbide (Carborundum)
Silicon Carbide (SiC)
mineral
Carborundum
Silicon Carbide (SiC)
mineral
Yellow Quartz
Silicon Dioxide (SiO2)
mineral
Coal (Bituminous Coal)
Caustobiolith / Sedimentary Rock
sedimentary
Quartz Matrix with Iron Staining / Mica Schist
Silicon Dioxide (SiO2) with Iron Oxide staining
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Corundum (Sapphire in Matrix)
Aluminum Oxide (Al2O3)
mineral
Quartz (Agate/Chalcedony)
Silicon Dioxide (SiO2)
mineral
Agate
Silicon dioxide (Chalcedony), SiO2
sedimentary
Ruby (Raw Corundum)
Al2O3 (Aluminum Oxide)
mineral
Quartz (Milky or Iron-stained)
Silicon Dioxide (SiO2)
mineral
Sandstone (Quartzite-rich)
Clastic Sedimentary Rock (primarily SiO2)
sedimentary
Sandstone
Arenite (SiO2 primarily)
sedimentary
Native Copper with Malachite/Oxide Coating
Native Copper (Cu)
mineral
Diamond (or Diamond Simulant)
Carbon (C) if diamond, various if simulant (e.g., Cubic Zirconia ZrO2)
gemstone