Granite
Granite (Plutonic Igneous Rock)
igneous
Category
Mineral Description (Anthropogenic Material)
Browse mineral description (anthropogenic material) specimens identified by the Rock Identifier community.
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Sandstone
Arenite (SiO2 primarily)
sedimentary
Sandstone
Arenite (Sandstone)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Sandstone
Clastic sedimentary rock (Quartz arenite)
sedimentary
Sandstone
Sandstone (composed predominantly of SiO2)
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Gravel / Limestone Fragment
Calcium Carbonate (CaCO3) / Fine-grained Sedimentary Rock
sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary
Stichtite in Serpentine (Atlantasite)
Mg6Cr2CO3(OH)16·4H2O in Mg3Si2O5(OH)4
metamorphic
Quartz pebble
Silicon dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartz Pebble with Drusy/Crystalline Pocket
Silicon Dioxide (SiO2)
mineral
Milky Quartz with Matrix
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Moonstone
Orthoclase (Potassium Aluminum Silicate), Formula: (K,Na)AlSi3O8
mineral
Silver (Morgan Dollar)
Native Silver (Ag) - 90% Silver, 10% Copper alloy
mineral
Amazonite
K(AlSi3O8), Microcline (potassium feldspar)
mineral
Quartz (Iron-Stained)
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Tumbled green aventurine
Quartz (SiO₂), commonly containing fuchsite mica inclusions
mineral
Amethyst quartz cluster
Quartz, SiO₂; purple color caused mainly by iron-related defects and irradiation
mineral
Diamond
C (Native Carbon)
mineral
Diamond (in Matrix)
Carbon (C)
mineral
Libyan Desert Glass
Impactite (vitreous silica), SiO2
mineral
Diamond (Faceted)
Carbon (C)
mineral
Diamond
Diamond (pure carbon, C)
mineral
Aragonite Star Cluster
Aragonite (Calcium Carbonate, CaCO3)
mineral
Crushed Stone / Gravel
Aggregatus saxum (variable mineral composition)
sedimentary
Milky quartz
Quartz, silicon dioxide (SiO₂)
mineral
Mammoth Molar Fossil
Mammuthus primigenius (Tooth fragment)
fossil
Drupa or Druzy Quartz on Geode Fragment
Crystalline Silicon Dioxide (SiO2)
mineral
Quartz / Calcite Pebble
SiO2 (Quartz) or CaCO3 (Calcite)
mineral
Limonite (vibrant yellowish-brown iron oxide)
Limonite (FeO(OH)·nH2O)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Quartz (Silicon Dioxide - SiO2)
mineral
Fulgurite
Fulgurite (Lechatelierite/Silica glass)
mineral
Jasper Agate
Silicon dioxide (SiO2)
mineral
Fossilized Shark Tooth
Chondrichthyes (Class) fossilized tooth
fossil
Chert
Microcrystalline Quartz (SiO2)
sedimentary