Agate (or Banded Agate)
Agate (a variety of Chalcedony, which is a cryptocrystalline form of Quartz); Chemical Formula: SiO₂ (Silicon Dioxide)
Mineral, specifically a Cryptocrystalline Quartz variety
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.
Quartz (likely Milky Quartz)
Quartz (SiO₂ - Silicon Dioxide)
Mineral
Citrine Geode (or Druzy Citrine)
Silicon Dioxide (SiO₂) - a variety of Quartz
Mineral
Sandstone
Sandstone (clastic sedimentary rock)
Rock
Ruby in Zoisite
Ruby (Corundum, Al2O3) in Zoisite (Calcium aluminum silicate hydroxide, Ca2Al3(SiO4)3(OH)) with some Hornblende
Metamorphic Rock (specifically a rock composed of minerals)
Quartz (likely Milky Quartz or Chalcedony)
Quartz (SiO2 - Silicon Dioxide)
Mineral
Lepidolite (likely)
K(Li,Al)3(Al,Si)4O10(F,OH)2 (Phyllosilicate mineral, part of the mica group)
Mineral
Rose Quartz
Rose Quartz (SiO₂)
Mineral
Clear Quartz (Rock Crystal)
Quartz (SiO₂)
Mineral
Rose Quartz
Quartz (SiO2) with trace impurities causing pink color
Mineral
Bauxite Ore
Hydrated aluminum oxides (e.g., Gibbsite Al(OH)3, Boehmite ̲̲̲̲AlOOH, Diaspore ̲̲̲̲AlOOH)
Mineral
Quartzite
Quartzite (primarily SiO2)
metamorphic
Quartz with Iron Stains
Quartz (SiO2) with iron oxide/hydroxide staining
Mineral
Calcite
Calcite (Calcium Carbonate, CaCO3)
mineral
Astrophyllite
Potassium Sodium Iron Manganese Titanium Silicate Hydroxide (K3NaFe7Ti2Si8O24(OH)7)
mineral
Smoky Quartz
SiO2 (Silicon Dioxide)
mineral
Quartzite
Quartzite (primarily SiO2)
Metamorphic
Fancy Jasper
Chalcedony (cryptocrystalline quartz) with inclusions
Mineral
Leopard Skin Jasper
Chalcedony (cryptocrystalline quartz) with inclusions
Mineral
Granite
Granite (a common name for a felsic intrusive igneous rock)
Igneous Rock
Quartz (beads)
SiO2 (Silicon Dioxide)
Mineral
Chert (Flint)
Chert (microcrystalline quartz)
sedimentary
![Lapis Lazuli (Lapis Lazuli (a rock composed primarily of Lazurite (Na,Ca)₈[(S,Cl,SO₄,OH)₂|(Al₆Si₆O₂₄)], with varying amounts of Calcite, Pyrite, and Sodalite.)) — Mineral](https://media.rockidentification.com/ac5a19c1-d5b9-4c2e-8fab-285264802654-thumbnail.jpg)
Lapis Lazuli
Lapis Lazuli (a rock composed primarily of Lazurite (Na,Ca)₈[(S,Cl,SO₄,OH)₂|(Al₆Si₆O₂₄)], with varying amounts of Calcite, Pyrite, and Sodalite.)
Mineral
Jasper (likely a variety of Brecciated Jasper or a patterned variety)
Silicon dioxide (SiO2)
Mineral
Rough Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Green Calcite
Calcite (CaCO3)
mineral
Puddingstone (Jasper Conglomerate)
Conglomerate (specific type: Jasper Conglomerate or Hertfordshire Puddingstone)
Sedimentary
Quartz
Silicon dioxide (SiO2)
Mineral
Gneiss
Gneiss (a rock type, not a specific mineral with a formula)
Metamorphic Rock
Sandstone
Quartz Arenite (a common type of sandstone, given the appearance), Arkose, Greywacke (depending on mineralogy)
Sedimentary Rock
Red Chalcedony (likely dyed)
Chalcedony (a variety of Quartz), SiO2
Mineral (Cryptocrystalline Quartz)
Quartz (pebble)
Quartz (SiO₂)
Mineral
Onyx Marble (also commonly called Onyx)
Calcite (CaCO3), often with other mineral impurities
Sedimentary Rock (specifically a type of Travertine)
Banded Gneiss
Gneiss (variable mineral composition)
metamorphic
Shale or Argillite
Shale (sedimentary) / Argillite (metamorphic)
Sedimentary or Metamorphic (low-grade)
Rose Quartz
Rose Quartz (SiO2)
Mineral
Sugilite
Sugilite (KNa2(Fe,Mn,Al)2Li3Si12O30)
Mineral
Moonstone
Adularia (orthoclase) or Albite (plagioclase), a feldspar mineral (KAlSi3O8 or NaAlSi3O8 respectively, often a mixture)
mineral
Gneiss
Gneiss (a metamorphic rock)
Metamorphic
Laterite
Laterite (no specific mineral formula as it's a rock type)
Sedimentary
Calcite
Calcite (CaCO3)
Mineral
Gneiss
Gneiss (pronounced 'nice')
Metamorphic Rock