Grey Limestone Pebble
Limestone (Calcium Carbonate - CaCO3)
sedimentary
Category
Sedimentary (Secondary Mineral Formation)
Browse sedimentary (secondary mineral formation) specimens identified by the Rock Identifier community.
Gossan (Limonite/Goethite)
Hydrated iron oxides (primarily FeO(OH)·nH2O)
mineral
Ironstone Concretion (likely)
Goethite/Hematite/Limonite cemented sediment
Sedimentary Rock
Popcorn
Zea mays everta (P. Wilson) (Botanical name for the corn variety)
Organic/Biogenic
Chert (Quartz Variety)
Chert (Silicon Dioxide, SiO2)
sedimentary
Quartzite pebble
Quartzite (primarily SiO2)
metamorphic
Ferruginous Sandstone with Ironstone Concretion
Goethite-rich Sandstone (FeO(OH))
sedimentary
Larimar
Pectolite (Sodium Calcium Silicate Hydroxide) - (NaCa2(Si3O8)(OH))
Mineral
Lunar Highlands Breccia (Meteorite)
Lunar Feldspathic Breccia
igneous
Basalt
Basalt (Aphanitic Mafic Igneous Rock)
igneous
Green Aventurine
Silicon dioxide (SiO2) with inclusions of Fuchsite mica
metamorphic
Chert (varietal known as Jasper or Flint)
Silicon Dioxide (SiO2)
Sedimentary Rock
Jasper
Jasper (Silicon Dioxide, SiO2)
sedimentary (microcrystalline quartz)
Red Jasper (Plum or Brick variety)
Silicon Dioxide (SiO2) with iron oxide inclusions (Hematite)
sedimentary (chemical/biological origin)
Red Jasper (possibly)
Jasper (a variety of Chalcedony, SiO2)
Mineral
Rose Quartz
SiO2 (Silicon Dioxide)
mineral
Amethyst
SiO2 (Silicon Dioxide)
Mineral
Chalcedony (Botryoidal or Agate nodule)
Silicon Dioxide (SiO2)
mineral
Red Jasper
Silicon Dioxide (SiO2) with Hematite (Fe2O3) inclusions
Sedimentary
Amethyst
SiO2 (Silicon Dioxide)
Mineral
Ferruginous Quartz
Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3/FeO(OH)) inclusions
mineral
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Granite (Dioritic variant)
Phaneritic Felsic Igneous Rock (primarily Quartz, Feldspar, and Mica)
igneous
Cubic Zirconia (CZ)
Cubic Zirconium Dioxide (ZrO2)
mineral (synthetic)
Grass (Organic Matter/Soil)
Poaceae (family of monocotyledonous flowering plants)
Organic Materia (Not a rock or mineral)
Rose Quartz
Rose Quartz (SiO₂)
Mineral
Banded Chert
Microcrystalline Quartz (SiO2)
sedimentary
Granite
Phaneritic Igneous Rock (composed primarily of Quartz, Alkali Feldspar, and Plagioclase)
igneous
Rose Quartz
Quartz (SiO2) with trace amounts of Titanium, Iron, or Manganese
mineral
Sunstone
Plagioclase Feldspar (specifically Oligoclase variety containing hematite or goethite inclusions)", composition: (Ca,Na)(Al,Si)2Si2O8
Mineral
Aquamarine
Beryl (Be3Al2Si6O18)
mineral
Amethyst
SiO2 (Silicon Dioxide)
Mineral
Quartz (specifically a water-worn river pebble)
Silicon Dioxide (SiO2)
Mineral
![Arfvedsonite in Quartz (also known as Eudialyte/Garnet Syenite variety) (Arfvedsonite [Na3(Fe2+)4Fe3+Si8O22(OH)2] within a silicate matrix) — igneous](https://media.rockidentification.com/a4026c5a-8968-420a-93d2-4bffc2cc7d5f-thumbnail.jpg)
Arfvedsonite in Quartz (also known as Eudialyte/Garnet Syenite variety)
Arfvedsonite [Na3(Fe2+)4Fe3+Si8O22(OH)2] within a silicate matrix
igneous
Aquamarine
Beryl (Be₃Al₂Si₆O₁₈)
mineral
Pink Quartz (Rose Quartz)
Silicon Dioxide (SiO2)
mineral
Mother of Pearl (Nacre)
Calcium Carbonate (primarily aragonite, with conchiolin)
Organic Gemstone/Biomineral
Gold-bearing Quartz
Native Gold (Au) in Quartz (SiO2) matrix
mineral
Brown Jasper (Likely)
Jasper (Cryptocrystalline Silicon Dioxide - SiO2)
Mineral
Red Jasper
Jasper (a variety of Quartz, SiO2)
Mineral
Granite
Intrusive Felsic Igneous Rock (primarily Quartz, Feldspar, and Mica)
igneous
Prasiolite and Quartz Crystal Cluster
Quartz (SiO2); Prasiolite is a variety of Quartz
mineral