Bog Iron / Limonite Concretion
Goethite/Limonite mixture (FeO(OH)·nH2O)
sedimentary
Category
Man Made Material (Anthropogenic 'Mineraloid')
Browse man made material (anthropogenic 'mineraloid') specimens identified by the Rock Identifier community.
Green Calcite (Onyx Marble)
Calcium Carbonate (CaCO3)
mineral
Geode with Quartz/Chalcedony
Silicon Dioxide (SiO2)
sedimentary
Granite Cobble
Phaneritic Felsic Igneous Rock (Granite)
igneous
Sandstone
Sandstone (various mineral compositions)
Sedimentary
Limestone
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Sandstone (Red Sandstone / River Stone)
Arenite (composed primarily of Quartz, SiO2, with Iron Oxide cementation)
sedimentary
Diamond
Diamond (C)
Mineral
Picture Jasper
Silicon Dioxide (SiO2) with mineral inclusions
sedimentary
Jasper (Red/Yellow)
Silicon Dioxide (SiO2) with impurities
sedimentary
Red Sandstone
Arenite (Ferruginous Sandstone)
sedimentary
Iron Meteorite
Iron Meteorite (primarily Kamacite and Taenite, Fe-Ni alloys)
mineral
Garnet Beads
Garnet Group (complex nesosilicates, e.g., Almandine Fe3Al2(SiO4)3)
Mineral
Basalt with Quartz/Feldspar Inclusions
Amygdaloidal or Porphyritic Mafic Volcanic Rock with Siliceous Veining
igneous
Quartzite Pebble
Metamorphic Quartz (SiO2)
metamorphic
Greenstone / Epidosite
Epidosite (Metasomatic rock consisting mainly of Epidite Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH) and Quartz)
metamorphic
Crushed Limestone
Calcium Carbonate (CaCO3)
sedimentary
Amber with Inclusion
Succiniferous fossil resin (C10H16O)
mineraloid
Blue Sphalerite (likely dyed or treated Druzy Quartz/Agate)
Zinc Sulfide (ZnS) or Silicon Dioxide (SiO2) with trade-name enhancement
Mineral
Schist
Mica Schist (primarily consisting of muscovite, biotite, and quartz)
metamorphic
Quartz
Quartz (SiO2 - Silicon Dioxide)
Mineral
Quartz
Quartz (SiO₂ - Silicon Dioxide)
Mineral
Jasper
Silicon Dioxide (SiO2)
mineral
Chert (variations include Flint or Jasper)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Sandstone (Red)
Arenite (primarily SiO2 with Iron Oxide staining)
sedimentary
Quartz
Quartz (SiO2, Silicon Dioxide)
Mineral
Quartz (likely macrocrystalline variety)
Quartz (SiO₂)
Mineral
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Vuggy Quartz on Matrix
Silicon Dioxide (SiO2)
mineral
Chert (Agate/Flint variant)
Microcrystalline Quartz (SiO2)
sedimentary
Olivine in Basalt matrix
Peridotite (Mg, Fe)2SiO4
igneous
Chert (Chalcedony/Agate)
Microcrystalline Quartz (SiO2)
sedimentary
Pebble (likely a type of sandstone or quartzite pebble)
Clastic Sediment (specifically, a rudite-sized clast). If the pebble is composed of a specific rock type, its scientific name would be that rock type (e.g., 'Quartzite pebble', 'Granite pebble', 'Chert pebble'). Given its appearance, it is likely a metamorphic quartzite pebble or a hard sandstone pebble.
Sedimentary rock
Chert (specifically Flint or Dark Chalcedony)
Silicon Dioxide (SiO2)
sedimentary
Chert (Nodule)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Quartz (Small fragments)
Silicon Dioxide (SiO2)
mineral
Rose Quartz with Schist Matrix
Silicon Dioxide (SiO2) with Mica-Schist
mineral
Granite
Phaneritic plutonic rock (Quartz + Feldspar + Mica)
igneous
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Quartz
Quartz (SiO₂)
Mineral