Slag
Anthropogenic Vitreous Silica/Iron oxides
mineral-like byproduct
Category
Organic (Non Rock)
Browse organic (non rock) specimens identified by the Rock Identifier community.
Learn about Organic (Non Rock) in the encyclopedia
View all →
Green Slate or Metamorphic Rock with Moss/Lichen
Metamorphic rock / Phyllite or Slate variant
metamorphic
Fossiliferous Limestone
Biogenic Sedimentary Rock (Calcium Carbonate, CaCO3)
sedimentary
Geode (unopened)
Chert / Chalcedony Geode (SiO2)
sedimentary
Probable amber fragment
Amber (fossilized plant resin; chiefly amorphous organic resin, commonly dominated by succinite)
gemstone
Quartzite
Quartzite (chiefly SiO2)
metamorphic
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Pumice
Pumice (Amorphous volcanic glass)
igneous
Chert (Common Opal or Agate)
Microcrystalline Quartz (SiO2)
sedimentary
Fossiliferous Limestone
Biogenic Sedimentary Rock (primarily CaCO3)
sedimentary
Red Siltstone (or Red Shale)
Clastic Sedimentary Rock (Composition: primarily Quartz, Clay minerals, and Hematite Fe2O3)
sedimentary
Basalt
Basalt
igneous
Quartzite pebble
Quartzite (SiO2)
metamorphic
Weathered polymictic gravel/conglomeratic rock
Polymictic conglomerate or poorly lithified alluvial gravel; chiefly quartz, feldspar, mica, and dark lithic fragments
sedimentary
Chert / Chalcedony
Silicon Dioxide (SiO2)
sedimentary
Breccia
Breccia (Clastic Sedimentary Rock)
sedimentary
Quartzite
Quartzite (SiO2-dominant rock)
metamorphic
Limestone with Calcite Veining
Sedimentary Carbonate Rock (CaCO3)
sedimentary
Weathered granitic rock
Granite (quartz–feldspar–mica intrusive rock; exact variety uncertain)
igneous
Fossilized Bivalve Shell
Class Bivalvia (fossilized)
fossil
Quartzite
Quartzite (chiefly SiO2)
metamorphic
Conglomerate
Conglomerative Sedimentary Rock
sedimentary
Green Opal
Hydrated amorphous silica (SiO2·nH2O)
mineral
Quartzite
Metamorphic Quartz Rock (SiO2)
metamorphic
Quartzite
Quartzite (SiO2 silicon dioxide)
metamorphic
Obsidian Arrowhead
Obsidian (Volcanic Glass)
igneous
Dinosaur Bone Fossil
Permineralized Dinosaur Bone
fossil
Poppy Jasper
Microcrystalline Quartz (SiO2) with hematite and other inclusions
sedimentary
Fossilized Tooth
Vertebrate Fossilized Tooth (Mineralized Biogenic Material)
fossil
Chert (Nodule)
Chert (Cryptocrystalline Silica, SiO2)
sedimentary
Slate
Slate (Metamorphic Rock)
metamorphic
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Quartzite
Quartzite (primarily SiO2)
metamorphic
Quartzite
Quartzite (SiO2-rich metamorphic rock)
metamorphic
Anthracite Coal
Anthracite (Carbon-based metamorphic rock)
metamorphic
Anthracite Coal
Anthracite (Carbon-rich metamorphic rock)
metamorphic
Fossiliferous Limestone (Coquina)
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Chert (Jasper variation)
Silicon Dioxide (SiO2)
sedimentary
Shale
Shale (Consolidated fine-grained clay/silt)
sedimentary
Quartzite Cobble
Quartzite (mostly SiO2)
metamorphic
Polished agate geode slice
Microcrystalline quartz (chalcedony), SiO₂
mineral
Quartzite River Stone
Quartzite (primarily SiO2)
metamorphic