Quartz (River Pebble)
Silicon Dioxide (SiO2)
Mineral
Category
Man Made Byproduct (Often Mistaken For Obsidian Or Emerald)
Browse man made byproduct (often mistaken for obsidian or emerald) specimens identified by the Rock Identifier community.
Sandstone (Ferruginous)
Arenite (primarily SiO2 with Fe2O3 staining)
sedimentary
Chert (specifically Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Sandstone (Quartzite-rich Pebble)
Arenite (primarily SiO2)
sedimentary
Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Quartzite (Milky Quartz pebble)
Silicon Dioxide (SiO2)
metamorphic
Sandstone
Arenite (primarily Quartz, SiO2)
sedimentary
Pumice
Pumice (Vesicular volcanic glass)
Igneous
Fluorite (Purple Octahedron)
Calcium Fluoride (CaF2)
Mineral
Basaltic Tuff / Volcanic Breccia
Pyroclastic Breccia / Lithic Tuff
igneous
Red Jasper
Jasper (Silicon Dioxide, SiO2)
sedimentary
Limestone (specifically fossiliferous/skeletal limestone)
Calcium Carbonate (CaCO3)
sedimentary
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Red Sandstone
Arenite (primarily Quartz with Hematite cement)
sedimentary
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Chert (Jasper/Flint variety)
Microcrystalline Quartz (SiO2)
sedimentary
Shale or Slaty Mudstone
Argillaceous sedimentary rock
sedimentary
Rhodonite
Manganese Silicate (Mn,Fe,Mg,Ca)SiO3
Mineral
Chert (Nodule)
Silicon Dioxide (SiO2)
sedimentary
Diamond
Cubic carbon (C)
mineral
Greenstone
Greenschist (containing chlorite, epidote, and actinolite)
metamorphic
Amber (Copal)
Organic gemstone, fossilized tree resin (often immature amber or copal)
Mineral
Quartzite
Quartzite (primarily SiO2)
metamorphic
Sandstone (Quartz Sandstone)
Arenite (primarily SiO2)
sedimentary
Quartzite
Quartzite (primarily SiO2)
metamorphic
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Quartz nodule (River pebble)
Silicon Dioxide (SiO2)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Quartz Geode Pebble
Silicon Dioxide (SiO2)
mineral
Green Fluorite
Calcium Fluoride (CaF2)
mineral
Quartz (River Pebble)
Silicon Dioxide (SiO2)
mineral
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Greenstone (possibly Basalt or Greenschist)
Greenschist (composed primarily of chlorite, actinolite, and epidote)
Metamorphic (low-grade)
Chert (concretionary/nodular variant)
Microcrystalline Quartz (SiO2) with possible fossil or mineral inclusions
sedimentary
Quartzite
Metamorphosed Quartz Sandstone (primarily SiO2)
metamorphic
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Quartzite
Quartzite (SiO2)
metamorphic
Quartzite
Quartzite (SiO2)
metamorphic
Chert (Flint/Jasper variety)
Microcrystalline Quartz (SiO2)
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
Mineral
Quartzite
Quartzite (primarily SiO2)
metamorphic
Quartzite
Quartzite (SiO2)
metamorphic