Dyed Tumbled Quartz (Dragon's Vein Agate/Quartz)
Silicon Dioxide (SiO2) with artificial dye
mineral
Category
Mineralological Specimen
Browse mineralological specimen specimens identified by the Rock Identifier community.
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Fossil Shark Tooth
Carcharadon sp. (likely Carcharodon carcharias or similar Lamniformes)
fossil
Weathered basaltic volcanic rock
Likely vesicular basalt or basaltic-andesite; chiefly plagioclase, pyroxene, and iron-bearing minerals
igneous
Gold in Quartz Matrix
Native Gold (Au) with Quartz (SiO2)
mineral
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Dyed Agate (Tumbled)
Silicon Dioxide (Chalcedony variety, artificially dyed)
gemstone
Quartz Vein in Schist
Quartz (SiO2) in Mica Schist
metamorphic
Cobalt Blue Glass / Cullet Glass
Silicon dioxide (Amorphous man-made glass)
mineral
Shale with Trace Fossils
Fissile mudrock (Shale)
sedimentary
Fossilized Oyster in Flint
Gryphaea or Exogyra embedded in SiO2 (Flint/Chert)
fossil
Brachiopod Fossil in Limestone
Phylum Brachiopoda embedded in sedimentary rock
fossil
Fossilized Bone Chunk
Permineralized Vertebrate Bone (indeterminant)
fossil
Clear Quartz
SiO2 (Silicon Dioxide)
gemstone
Quartz Geode with Calcite
Silicon Dioxide (SiO2) and Calcium Carbonate (CaCO3)
Mineral/Geode
Note: Item is not a geological specimen
n/a
none
Botryoidal Agate
Silicon Dioxide (SiO2)
mineral
Granite with Mafic Xenolith
Intrusive Igneous Rock containing a Xenolith
igneous
Chert (Chalcedony)
Cryptocrystalline Quartz (SiO2)
sedimentary
Quartz (Field Specimen)
Silicon Dioxide (SiO2)
mineral
Chert (with potential fossil inclusion)
Microcrystalline Quartz (SiO2)
sedimentary
Lemon (Mock specimen mimicking Citrine/Sulfur)
Citrus x limon
Organic (Biological specimen)
Ferruginous Quartz
Silicon Dioxide (SiO2) with iron oxide inclusions (Limonite/Hematite)
mineral
Chert (Arrowhead/Scraper Preform)
Silicon dioxide (SiO2)
sedimentary
Quartz (Citrine or Iron-Stained variety)
Silicon Dioxide (SiO2)
mineral
Quartz-rich conglomeratic sandstone
Lithic arkose/conglomerate, dominated by quartz and feldspar grains
sedimentary
Raw black tourmaline (likely schorl)
Schorl, sodium–iron tourmaline; approximately NaFe²⁺₃Al₆(BO₃)₃Si₆O₁₈(OH)₄
mineral
Banded Gneiss
Metamorphic Gneiss (High-grade regional metamorphism specimen)
metamorphic
Weathered quartz-rich sandstone or granitic rock
Indeterminate; likely iron-stained quartz sandstone, possibly weathered granite
sedimentary
Quartz Vein in River Siltstone
Crystalline Quartz (SiO2) in Siliclastic Matrix
sedimentary
Unable to identify - Image contains non-geological items
N/A
Fossilized coral or carbonate fossil fragment
Calcareous fossil, likely colonial coral (order Hexacorallia; uncertain from image)
fossil
Small rounded pebble, likely quartz-rich stone
Indeterminate from photograph; possibly microcrystalline quartz (SiO₂) or a weathered silicate pebble
mineral
Calcite specimen
Calcite (calcium carbonate, CaCO₃), likely botryoidal or drusy calcite
mineral
Blue Obsidian
Volcanic Glass (SiO2 with inclusions)
igneous
Muscovite Schist
Metamorphic rock primarily composed of quartz and muscovite mica
metamorphic
Pyrite with Quartz
Iron Sulfide (FeS2) with Silicon Dioxide (SiO2)
mineral
Agate Geode
Cryptocrystalline Quartz (SiO2) with Chalcedony banding
mineral
Quartz (Milky/Clear variety)
Silicon Dioxide (SiO2)
mineral
Jasper
Silicon Dioxide (Microcrystalline Quartz), SiO2
sedimentary
Agate
Silicon Dioxide (Chalcedony), SiO2
sedimentary
Vein Quartz in Basalt or Chert
Silica-veined dark lithic rock (Quartz veins in microcrystalline matrix)
sedimentary
Jasper
Microcrystalline Quartz (SiO2)
sedimentary