Amber
Succinite (fossilized tree resin)
mineraloid / sedimentary organic material
Category
Mineraloid
Browse mineraloid specimens identified by the Rock Identifier community.
Learn about Mineraloid in the encyclopedia
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Cullet Glass (Strawberry Glass)
Amorphous Silicon Dioxide (SiO2) with metallic dopants
Mineraloid (Synthetic/Man-made)
Goldstone
Aventurine glass (Synthetic glass with copper inclusions)
mineraloid / man-made glass
Ambergris
Ambrein (C30H52O)
mineraloid / organic geological substance
Green Sea Glass
Amorphous Silica (man-made glass), SiO2 + additive metal oxides
mineraloid / anthropogenic (man-made origin)
Sea Glass (Frosted Glass)
Amorphous Silica (SiO2) with various additives
Man-made material (Anthropogenic 'mineraloid')
Fordite
Anthropogenic paint-rock
mineraloid (human-made geological specimen)
Sea Glass (specifically Frosted White)
Amorphous Silica (substance: Sodium-calcium silicate glass)
Mineraloid (Anthropogenic/Man-made rock)
Aventurine (likely Green Aventurine)
Silicon Dioxide (SiO2) with mineral inclusions
Mineral/Mineraloid within a rock matrix
Citrine
Silicon Dioxide (SiO2)
mineral
Fossilized oyster shell in limestone
Bivalvia fossil; chiefly calcite (CaCO₃)
fossil
Geode with Quartz/Chalcedony
Silicon Dioxide (SiO2)
sedimentary
River Pebbles (Stream-rounded rocks)
Fluvial Detritus (varied mineralogy)
Mixed (predominantly sedimentary and igneous)
Dalmatian jasper
Quartz-bearing, orbicular microcrystalline silica (commonly sold as “Dalmatian jasper”; often an altered porphyritic igneous rock)
igneous
Greenstone (Metabalt)
Chlorite-actinolite schist (Greenstone)
metamorphic
Petrified Wood
Silicified Wood (SiO2)
mineral
Labradorite
(Ca, Na)(Al, Si)4O8 (Calcium Sodium Aluminum Silicate)
mineral
Sand Grain (Quartz)
Silicon Dioxide (SiO2)
sedimentary
Small quartz-rich stone, possibly granite fragment
Indeterminate; likely quartz (SiO₂) with feldspar and/or mica
igneous
Optical Calcite
Calcium Carbonate (CaCO3)
mineral
Mixed River Pebbles (Jasper, Hematite, and Quartzites)
Silicon dioxide (Jasper/Quartz) and Iron oxide (Hematite)
sedimentary
Banded Gneiss (with Quartz Vein)
Gneiss (Metamorphic rock of varying mineralogy)
metamorphic
Small rounded stone or mineral fragment
Indeterminate; likely a common quartz- or feldspar-bearing silicate fragment
mineral
Rounded river pebble (likely weathered granite or metamorphic rock)
Indeterminate; possible granitic or quartz-rich lithology
igneous
Schist (likely Mica Schist)
Mica Schist
metamorphic
Chalcopyrite
Copper Iron Sulfide (CuFeS2)
mineral
Tumbled lepidolite-rich pegmatite (probable)
Lepidolite, K(Li,Al)3(Si,Al)4O10(F,OH)2, in a granitic pegmatite matrix
mineral
Weathered greenish rock fragment
Indeterminate; possibly epidote- or chlorite-bearing altered silicate rock
mineral
Hag Stone
Sandstone or Limestone with Solution Holes (Bioturbation/Erosion)
sedimentary
Granite Cobble
Plutonic Granite
igneous
Graphite Schist
C (Carbonaceous Schist)
metamorphic
Tumbled green aventurine (probable)
Quartz, SiO₂, with fuchsite mica inclusions
mineral
Mixed River Pebbles
Clastic Sedimentary Alluvial Deposit / Polymictic Conglomerate Clasts
sedimentary
Greenstone / Glauconitic Siltstone
Metabasalt or Glauconite-rich Sedimentary Rock
metamorphic or sedimentary
Cat's Eye Moonstone (Feldspar)
Orthoclase (KAlSi3O8) with Albite (NaAlSi3O8) inclusions
mineral
Small metallic meteorite-like specimen
Unclassified iron-rich meteorite candidate; possibly an ordinary chondrite or terrestrial slag
meteorite
Granite Pegmatite
Granitic Pegmatite (composition: SiO2 with KAlSi3O8)
igneous
Limestone or Sandstone Cobble
Sedimentary rock (Calcium carbonate or Quartz based)
sedimentary
Green fluorite crystal
Fluorite (calcium fluoride, CaF₂)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Optical Calcite (Iceland Spar)
Calcite (Calcium Carbonate, CaCO3)
mineral
Banded Calcite (Mexican Onyx)
Calcium Carbonate (CaCO3)
mineral