Blue Crackle Quartz (Dyed Fire Agate/Quartz)
Silicon Dioxide (SiO2) with artificial dye treatment
mineral
Category
Industrial Byproduct
Browse industrial byproduct specimens identified by the Rock Identifier community.
Quartzite Pebbles
Quartzite (SiO2)
metamorphic
Desert Rose (Gypsum Variety)
Gypsum (Calcium Sulfate Dihydrate) - CaSO4·2H2O
mineral
Granite Pegmatite
Coarse-grained Granite (SiO2 - Aluminum and Alkalies)
igneous
Man-made Metal Pin (Non-geological)
Antimony-Lead Alloy or Zinc/Brass Base with Electroplating
Metal Alloy / Manufactured Artifact
Synthetic Resin (Artificial Specimen)
Polyurethane or Polyester Resin
mineraloid (man-made)
Goldfish Cracker (Culinary Mimic)
Cibus aurum (Commonly composed of Enriched Wheat Flour and Cheddar Cheese)
Anthropogenic Sedimentary-style Organic Solid
Note: Item is a Synthetic/Man-made Object
Titanium-coated Stainless Steel (Fe-Cr-Ni-Ti)
Non-geological
Engineered Quartz Stone
Agglomerated Quartz (SiO2 + Polymer Resin)
mineral-based composite
Bowling Ball (Brunswick T-Zone Deep Space)
Polyester resin / Polyurethane polymer
Synthetic (not a natural rock)
![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
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Pumice
Pumicite
igneous
Quartzite
Quartzite (SiO2)
metamorphic
Garnetiferous Quartzite (Garnet Gneiss Pebble)
Garnet-bearing Quartzite or Quartz-Feldspar Gneiss
metamorphic
Silver (Morgan Dollar)
Native Silver (Ag) - 90% Silver, 10% Copper alloy
mineral
Rough Quartz (var. Citrine or Yellow Quartz)
Silicon Dioxide (SiO2)
mineral
Fossilized Shark Tooth
Carcharodon (Galeocerdo sp. or Lamniform)
mineral
Synthetic Resin / Plastic Figurine
Synthetic Polymer (Copolymer of Polyethylene or Resin)
Mineraloid-like Synthetic Material
Potassium-Rich Silicate Clay (inferred from biological context)
Phyllosilicate group (likely Illite or Smectite within surrounding soil substrate)
mineral
Quartzite
Quartzite (primarily SiO2)
metamorphic
Anthracite Coal
Anthracite (Carbon based fossil fuel)
metamorphic
Diamond
Diamond (pure Carbon, C)
mineral
Green Fluorite
Fluorite (Calcium Fluoride, CaF2)
mineral
Limonite (Iron Ore)
Goethite and related iron hydroxides (FeO(OH)·nH2O)
mineral
White Quartz Sphere
Silicon Dioxide (SiO2)
mineral
Man-made Jewelry Charm (Enameled Metal)
Not a natural mineral; composed of base metal alloy (likely zinc or brass) and epoxy resin/enamel.
Synthetic / Manufactured Artifact
Pumice
Pumice (a highly vesicular volcanic glass)
igneous
Muscovite Mica (in Quartz matrix)
Potassium aluminum silicate hydroxide fluoride (KAl2(AlSi3O10)(F,OH)2)
mineral
Chert / Yellow Jasper
Silicon Dioxide (SiO2)
sedimentary
Aquamarine
Beryl (Be3Al2Si6O18)
mineral
Raw Diamond
Carbon (C)
mineral
Sandstone-based Concrete Fragment
Cementitious Composite with Sedimentary Aggregate
sedimentary (man-made/anthropogenic)
Quartzite Pebble
Quartzite (SiO2)
metamorphic
Red Garnet (likely Almandine)
Almandine (Fe3Al2(SiO4)3)
mineral
Jasper
Jasper (Silicon Dioxide, SiO2)
sedimentary
Diamond (in Matrix)
Carbon (C)
mineral
Anthracite Coal
Coal (predominantly carbon)
sedimentary
Limonite (Iron Ore)
FeO(OH)·nH2O (Hydrated Iron Oxide)
mineral
Crushed Stone (Gravel/Aggregates)
Crushed rock aggregate (varied composition including Granite, Limestone, and Quartz)
sedimentary and igneous (mixed)
Drill Core Samples (Varied Lithology)
Multi-lithological core samples (containing potential granite, marble, and phyllite/schist sequence)
igneous, sedimentary, and metamorphic
Limonite (Iron Ore)
Limonite (Hydrated iron oxide - FeO(OH)·nH2O)
mineral