Quartzite Pebble
Quartzite (mostly SiO2)
metamorphic
Category
Sedimentary (If Natural Jasper) Or Artificial (If Slag)
Browse sedimentary (if natural jasper) or artificial (if slag) specimens identified by the Rock Identifier community.
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Chert (Septarian Nodules / Weathered Silex)
Microcrystalline Quartz (SiO2)
sedimentary
Quartzite
Quartzite (SiO2)
metamorphic
Gold Nugget
Native Gold (Au)
mineral
Geode (unopened)
Chert / Chalcedony Geode (SiO2)
sedimentary
Chert Nodule (Commonly known as a Flint or River Cobble)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Aragonite Star Cluster (or Aragonite Sputnik)
Aragonite (Orthorhombic Calcium Carbonate, CaCO3)
mineral
Quartz with Limonite Staining
Silicon Dioxide (SiO2) with Hydrated Iron Oxide (FeO(OH)·nH2O)
Mineral
Greenstone
Greenschist (composed of actinolite, chlorite, and epidote)
metamorphic
Unidentified Rock Fragment
Unknown
Rock
Green Aventurine
Aventurine Quartz (SiO2 with inclusions of Fuchsite mica)
metamorphic
Basalt (Lava Rock) and Dyed Glass/Quartz
Scoria (Vesicular Basalt)
igneous
Amber
Succinite (Fossilized Tree Resin)
Organic Mineraloid
Chert Nodule (River Cobble)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Agate (specifically Chalcedony/Banded Agate)
Silicon Dioxide (SiO2)
sedimentary
Quartz (River Pebble)
Silicon Dioxide (SiO2)
mineral
Amethyst
Silicon dioxide / Violet Quartz (SiO2)
mineral
Milky Quartz (with Chlorite/Mineral Inclusions)
Silicon Dioxide (SiO2)
mineral
Wishing Stone (Basalt with Quartz Vein)
Basalt containing a microcrystalline quartz (SiO2) or calcite vein
igneous
Basalt with Calcite Veins
Basalt (Mafic Volcanic Rock)
igneous
Copper-bearing Quartz (likely Malachite on Quartz matrix)
Cu2CO3(OH)2 (Malachite) on SiO2 (Quartz)
mineral
Basalt (with possible Olivine inclusions)
Mafic Igneous Rock (primarily Plagioclase and Pyroxene)
igneous
Quartz on Basalt
Silicon Dioxide (SiO2) on Mafic Igneous Rock
Mineral on Igneous Rock
Pumice
Pumicite
igneous
Basalt
Basalt (Aphanitic Mafic Volcanic Rock)
igneous
Quartzite Cobble
Quartzite (primarily SiO2)
metamorphic
Quartz (Milky or Druzy Quartz)
Silicon Dioxide (SiO2)
mineral
Amethyst
SiO2 (Silicon Dioxide) - Purple variety of Quartz
mineral
River Stone (likely Quartzite or Chert)
Recrystallized Silicon Dioxide (SiO2)
metamorphic
Milky Quartz Pebble
Quartz (Silicon Dioxide - SiO2)
mineral
Chrysocolla in Matrix
Hydrated copper phyllosilicate mineral (Cu,Al)2H2Si2O5(OH)4·nH2O
mineral
Tiger's Eye
Pseudomorph of Macrocrystalline Quartz after Crocidolite (SiO2)
mineral
Ruby (Corundum)
Corundum (Aluminum Oxide) with chromium trace elements, Al2O3
mineral
Snowflake Obsidian
Spherulitic Volcanic Glass (primarily SiO2 with Cristobalite inclusions)
igneous
Wishing Stone (Gneiss or Basalt with Quartz Vein)
Gneiss or Metabasalt (with a Quartz or Calcite intrusion)
metamorphic
Limestone (Cliff Formation)
Limestone (predominantly CaCO3 as calcite)
Sedimentary
Rose Quartz
Rose Quartz (Silicon Dioxide, SiO2)
mineral
Druzy Chalcedony/Quartz on Fluorite core
Silicon Dioxide (SiO2) on Calcium Fluoride (CaF2)
mineral
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Scoria (Lava Rock)
Scoria
igneous