Sedimentary Or Igneous (Secondary Formation)

Browse sedimentary or igneous (secondary formation) specimens identified by the Rock Identifier community.

Feldspar

KAlSi3O8 - NaAlSi3O8 - CaAl2Si2O8

mineral

Gneiss (with Mica and Quartz)

Gneissic Metamorphic Rock

metamorphic

Quartz

Silicon Dioxide (SiO2)

mineral

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

mineral

Clear Quartz

Silicon Dioxide (SiO2)

mineral

Clear Quartz

Crystalline Silicon Dioxide (SiO2)

mineral

Milky Quartz

Quartz (Silicon Dioxide - SiO2)

mineral

Quartz (Milky/Rose variety)

Silicon Dioxide (SiO2)

mineral

Gneiss

metamorphic

Yellow Calcite

Calcium Carbonate (CaCO3)

mineral

Fluorite

Fluorite (Calcium Fluoride, CaF2)

mineral

Pyrite

Iron Sulfide (FeS2)

mineral

Pyrite

Iron Sulfide (FeS2)

mineral

Pyrite

Iron Disulfide (FeS2)

mineral

Rough Precious Opal

Hydrated Silica (SiO2·nH2O)

mineral

Clear Quartz

Silicon Dioxide (SiO2)

mineral

Chalcedony (Agate/Blue Quartzite)

Silicon Dioxide (SiO2)

mineral

Chalcedony (River Stone)

Microcrystalline Quartz (SiO2)

mineral

Gneiss (Metamorphic Rock)

Gneiss

metamorphic

Chalcedony

Cryptocrystalline Quartz (SiO2)

Mineral

Clear Quartz

Silicon Dioxide (SiO2)

mineral

Gneiss (specifically Amphibolite Gneiss)

Gneiss

metamorphic

Gneiss (Metamorphic Rock)

Gneiss

metamorphic

Granite (Dioritic or Hornblende-rich)

Phaneritic Plutonic Felsic to Intermediate Igneous Rock

igneous

Tanzanite

Blue/Violet Zoisite (Ca2Al3(SiO4)(Si2O7)O(OH))

mineral

Larimar

Pectolite (NaCa2Si3O8(OH))

mineral

Amazonite

Potassium aluminum silicate (KAlSi3O8)

mineral

Milky Quartz (Druzy Geode fragment)

Silicon Dioxide (SiO2)

mineral

Quartzite with vugs/druzy quartz

Crystalline Silicon Dioxide (SiO2)

metamorphic

Polished Ocean Jasper

Orbicular Jasper (variety of Chalcedony/Quartz, SiO2)

mineral

Limonite (Yellow Ochre)

FeO(OH)·nH2O (Hydrous iron(III) oxide-hydroxide mixture)

Mineral (Iron Ore)

Native Copper

Native Copper (Cu)

mineral

Clear Quartz (Tumbled)

Silicon Dioxide (SiO2)

mineral

Turquoise

Turquoise (CuAl6(PO4)4(OH)8·4H2O)

mineral

Ocean Jasper

Spherulitic Chalcedony (SiO2)

mineral

Chlorastrolite (Greenstone)

Chlorastrolite (Pumpellyite variety), Ca2(Mg,Fe)Al2(SiO4)(Si2O7)(OH)2·H2O

mineral

Chrysocolla in Quartz (Quantum Quattro variant)

Hydrated copper silicates (Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O) often mixed with SiO2

mineral

Quartz (Iron-stained)

Silicon Dioxide (SiO2)

mineral

Silver (Native Element / Alloy)

Silver (Ag)

mineral

Chrysocolla

Hydrated copper silicate (Cu,Al)2H2Si2O5(OH)4·nH2O

mineral

Limonite (Ironstone)

Limonite (Hydrated iron(III) oxide-hydroxide, FeO(OH)·nH2O)

mineral

Limonitic Quartzite

Metamorphosed sandstone with Limonite (FeO(OH)·nH2O) staining

metamorphic