Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Category
Sedimentary (Formed From Silica Deposits)
Browse sedimentary (formed from silica deposits) specimens identified by the Rock Identifier community.
Limestone (specifically Grainstone or Micrite)
Calcium Carbonate (CaCO3)
sedimentary
Rhodonite
Manganese Silicate (Mn,Fe,Mg,Ca)SiO3
Mineral
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Biotite Mica
K(Mg, Fe)3AlSi3O10(F, OH)2
mineral
Sandstone
Arenite
sedimentary
Limonite (Iron Ore)
Hydrated Iron(III) Oxide-Hydroxide (FeO(OH)·nH2O)
mineral
Ocean Jasper (Orbicular Jasper)
Silicon Dioxide (SiO2) with various inclusions
sedimentary (geologically classified as a variety of chalcedony/quartz)
Blue Apatite
Apatite (Calcium Phosphate) - Ca5(PO4)3(F,Cl,OH)
mineral
Quartz (Milky/Smoky variety on matrix)
Silicon Dioxide (SiO2)
mineral
Black Veined Jasper (Spiderweb Jasper)
Silicon Dioxide (SiO2)
sedimentary
Red Jasper (possibly)
Jasper (a variety of Chalcedony, SiO2)
Mineral
Coal (most likely Bituminous or Anthracite)
Coal (primarily composed of carbon with varying amounts of other elements)
Sedimentary rock
Amber
Succinite (Fossilized Resin)
mineral
Red Swirl Beads (Likely Resin or Glass, simulating Red Jasper or Agate)
N/A (for the beads as pictured); Red Jasper: SiO2 (Chert variety); Red Agate: SiO2 (Chalcedony variety)
Organic (if resin) or Synthetic (if glass); simulating Sedimentary or Metamorphic (for natural stones)
Geode Nodules / Chalcedony Geode
Silicon Dioxide (SiO2) - Amorphous to Cryptocrystalline Quartz
sedimentary
Chalk (Calcitic)
Calcium Carbonate (CaCO3) - Biogenic Sedimentary Rock
sedimentary
Bumblebee Jasper
Calcite-bearing Volcanic Tuff containing Sulfur and Arsenic (Orpiment/Realgar)
sedimentary
Fossilized Crinoid Stem Columnal
Phylum Echinodermata; Class Crinoidea (CaCO3)
sedimentary
Gastropod Steinkern (Fossilized Snail Cast)
Phylum Mollusca, Class Gastropoda (Commonly CaCO3 or SiO2 after replacement)
Sedimentary
Fossil Crab
Decapoda (likely Avitelmessus or Raninidae family)
sedimentary
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
mineral
Amethyst
SiO2 (Silicon Dioxide with Iron impurities)
mineral
Granite
Phaneritic Plutonic Felsic Rock
igneous
Coquina
Biogenic Limestone (Calcite / CaCO3)
sedimentary
Amethyst
Amethyst (Silicon Dioxide, SiO2)
mineral
Hematite
Iron(III) oxide (Fe2O3)
mineral
Quartzite Pebble
Metamorphic Quartzite (SiO2)
metamorphic
Hematite
Iron(III) oxide (Fe2O3)
mineral
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
![Turquoise (Hydrated phosphate of copper and aluminium [CuAl6(PO4)4(OH)8·4H2O]) — Mineral](https://media.rockidentification.com/2fc8ee47-9aaf-4e01-9b51-63927847540c-thumbnail.jpg)
Turquoise
Hydrated phosphate of copper and aluminium [CuAl6(PO4)4(OH)8·4H2O]
Mineral
Dendritic Agate
Dendritic Agate (Silicon Dioxide with Manganese or Iron Oxide inclusions, SiO2)
mineral
Chalk (Limestone variant)
Calcium Carbonate (CaCO3)
sedimentary
Sandstone (likely Greywacke or Lithic Sandstone)
Arenite / Wacke
sedimentary
Dyed Howlite (Dyed Red)
Calcium Borosilicate Hydroxide (Ca2B5SiO9(OH)5)
mineral
Native Gold (in earring form)
Gold (Au)
mineral
Amber (Cherry Amber)
Succinite (C10H16O)
Organic Gemstone
Sandstone (likely Arkosic)
Clastic Sedimentary Rock (primarily SiO2 with Feldspar)
sedimentary
Milky Quartz
Quartz (SiO2)
Mineral
Quartz Geode
Silicon Dioxide (SiO2)
sedimentary
Turquoise
Turquoise (CuAl6(PO4)4(OH)8·4H2O)
mineral
Jasper (Iron-rich)
Silicon Dioxide (SiO2) with Fe2O3 (Hematite) impurities
sedimentary