Botryoidal Aragonite (Cave Popcorn)
Aragonite (Calcium Carbonate, CaCO3)
mineral
Category
Sedimentary (Physico Chemical Precipitate)
Browse sedimentary (physico chemical precipitate) specimens identified by the Rock Identifier community.
Milky Quartz with Iron Staining
Quartz (Silicon Dioxide, SiO2)
mineral
Quartzite
Quartzite (primarily SiO2)
metamorphic
Agate (Thunderegg segment)
Silicon dioxide (SiO2) - Microcrystalline Quartz/Chalcedony
mineral
Shale or Slaty Mudstone
Argillaceous sedimentary rock
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Sea Glass (Frosted Glass)
Amorphous Silica (SiO2) with various additives
Man-made material (Anthropogenic 'mineraloid')
Serpentine
Antigorite, Lizardite, or Chrysotile (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4
metamorphic
Epidosite (Unakite-related)
Epidosite (predominantly Epidote, Ca2(Al2,Fe3+)(SiO4)3(OH))
metamorphic
Pink Tumbled Agate (Dyed)
Silicon Dioxide (SiO2) with artificial dyes
mineral
Quartzite
Quartzite (SiO2)
metamorphic
Pink Dyed Agate (Banded Chalcedony)
Silicon dioxide (SiO2) - variety Chalcedony
mineral
Gold Nugget
Native Gold (Au)
mineral
Ferruginous Quartz
Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
Mineral
Chert Breccia
Brecciated Chert (Microcrystalline Silica)
sedimentary
Diorite
Diorite (intermediate intrusive igneous rock)
igneous
Aura Quartz
Titanium/Titanium-Gold treated Silicon Dioxide (SiO2)
mineral
Aqua Aura Quartz
Titanium/Gold-coated Silicon Dioxide (SiO2)
mineral
Quartzite
Quartzite (composed primarily of SiO2)
metamorphic
Howlite and Purpurite druzy
Calcium Borosilicate Hydroxide (Howlite) and Manganese Phosphate (Purpurite)
mineral
Pink Quartzite
Quartzite (primarily SiO2)
metamorphic
Snowflake Obsidian
Vitreous Volcanic Glass (Siliceous Obsidian with Cristobalite inclusions)
igneous
Serpentine (Greenstone)
Antigorite, Lizardite, and Chrysolite mixture (Mg3Si2O5(OH)4)
metamorphic
Quartz (specifically Quartzite or Massive Quartz)
Silicon Dioxide (SiO2)
Mineral
Quartzite
Metamorphosed Quartz Sandstone (primarily SiO2)
metamorphic
Quartz (Iron-stained or Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Quartzite Pebble
Quartzite (primarily SiO2)
metamorphic
Mahogany Obsidian
Volcanic Glass with Hematite/Magnetite inclusions
igneous
Quartzite
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Gold
Aurum (Elemental Gold, Au)
Mineral, Metal (element)
Quartz (Milky or Pink-tinged)
Silicon Dioxide (SiO2)
mineral
Gold Nugget
Native Gold (Au)
mineral
White Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
African Turquoise (Jasper)
Polychrome African Jasper (often marketed as 'African Turquoise' due to its color, but it is not true turquoise)
Rock
Quartz Pebble (Sea Glass-like texture)
Silicon Dioxide (SiO2)
mineral
Basalt (River Stone)
Basalt (Mafic Extrusive Igneous Rock)
igneous
Sandstone
Arenite
sedimentary
Agate (specifically Lake Superior Agate style or Banded Chalcedony)
Silicon Dioxide (SiO2) - Cryptocrystalline Quartz
mineral
Soapstone (Steatite)
Steatite (primarily Talc: Mg3Si4O10(OH)2)
metamorphic
Micaceous Rock (likely Muscovite Schist/Gneiss or a Muscovite-rich Specimen)
Predominantly Muscovite (KAl2(AlSi3O10)(F,OH)2), often found in rocks like Muscovite Schist or Muscovite Gneiss.
Metamorphic, Mineral (within a rock type)