Granite
Phaneritic plutonic felsic rock (primarily Quartz, Feldspar, and Mica)
igneous
Category
Mineral Like Byproduct (Technogenic)
Browse mineral like byproduct (technogenic) specimens identified by the Rock Identifier community.
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Sandstone with Iron Oxide Concretion
Arenite with Hematite/Goethite Concretion
sedimentary
Blue Quartz
Quartz (Silicon Dioxide) with inclusions, SiO2
mineral
Rhodonite
Manganese Silicate (Mn,Fe,Mg,Ca)SiO3
mineral
Glauconite (Green Sandstone)
Glauconite (K,Na)(Fe,Al,Mg)2(Si,Al)4O10(OH)2
sedimentary
Vesicular Basalt (Lava Rock)
Vesicular Basalt
igneous
Greenstone
Greenschist
metamorphic
Plume Agate
Silicon Dioxide (SiO2) - Chalcedony Variety
mineral
Geode half
Geode (often quartz/chalcedony based)
sedimentary or igneous
Fossil Shark Tooth
Chondrichthyes (class)
fossil
Diamond in Kimberlite
Kimberlite host rock with C (Carbon) inclusion
igneous
Banded Gneiss (with Quartz Vein)
Gneiss (Metamorphic rock of varying mineralogy)
metamorphic
Snowflake Obsidian
Spherulitic Obsidian (primarily SiO2)
igneous
Bauxite
Bauxite (mixture of hydrous aluminum oxides: Al(OH)3 & AlO(OH))
sedimentary
Quartz with Iron Staining and Chlorite Inclusions
Silicon Dioxide (SiO2)
mineral
Limonite Nugget
Limonite (Hydrated iron oxide-hydroxide, FeO(OH)·nH2O)
mineral
Rhodonite
Rhodonite (Manganese Iron Magnesium Calcium Silicate - (Mn,Fe,Mg,Ca)SiO3)
mineral
Lepidolite
K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2
mineral
Leopardite
Porphyritic Quartz Monzonite or Rhyolite
igneous
Fluorite
Calcium fluoride (CaF2)
mineral
Greenstone / Epidosite
Metamorphosed Mafic Igneous Rock (Epidote-Chlorite group)
metamorphic
Green Aventurine
Silicon Dioxide (SiO2) with inclusions of Fuchsite mica
metamorphic
Green Aventurine
SiO2 (Quartz with Fuchsite inclusions)
mineral
Sunstone
Plagioclase Feldspar (Na,Ca)(Si,Al)4O8
mineral
Quartz with Tourmaline inclusion (Tourmalinated Quartz)
Silicon Dioxide (SiO2) with Tourmaline inclusions
mineral
Basalt with Epidote
Mafic volcanic rock with Epidote (Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH))
igneous
Obsidian
Volcanic Glass (predominantly SiO2)
igneous
Diorite
Intermediate Phaneritic Plutonic Rock - Diorite
igneous
Kimberlite with Diamond
Kimberlite (Porphyritic Peridotite)
igneous
Amygdaloidal Basalt
Amygdaloidal Basalt
igneous
Limonite
FeO(OH)·nH2O
mineral
Gneiss
High-grade metamorphic rock (Gneiss)
metamorphic
Lepidolite Polished Point
Lepidolite (K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2)
mineral
Blue Quartzite (Blue Aventurine)
SiO2 (Silicon Dioxide with Dumortierite/Crocidolite inclusions)
metamorphic
Fossil Shark Tooth (embedded in matrix)
Lamniformes (likely Cretalamna or Squalicorax) within phosphatic/calcareous matrix
sedimentary
Fluorite
Fluorite (Calcium Fluoride, CaF2)
mineral
Schist
Mica Schist
metamorphic
Gneiss
Gneiss (High-Grade Metamorphic Rock)
metamorphic
Sandstone
Arenite (lithic or quartz sandstone)
sedimentary
Petrified Wood Agate
Silicified Wood (primarily SiO2)
fossil
Howlite
Calcium borosilicate hydroxide (Ca2B5SiO9(OH)5)
mineral
Fossilized Stingray Mouth Plate
Myliobatidae gen. et sp. indet. (e.g., Myliobatis, Aetobatus)
fossil