Jasper (with orbicular/unakitoid tendencies)
Silicon Dioxide (SiO2) with iron and epidote inclusions
sedimentary (chemically precipitated) or metamorphic
Category
Metamorphic Or Sedimentary (With Staining)
Browse metamorphic or sedimentary (with staining) specimens identified by the Rock Identifier community.
Quartz (in matrix)
Quartz (SiO₂)
mineral
Pebble (likely a type of sandstone or quartzite pebble)
Clastic Sediment (specifically, a rudite-sized clast). If the pebble is composed of a specific rock type, its scientific name would be that rock type (e.g., 'Quartzite pebble', 'Granite pebble', 'Chert pebble'). Given its appearance, it is likely a metamorphic quartzite pebble or a hard sandstone pebble.
Sedimentary rock
Cobaltoan Calcite / Pink Dolomite (Possible)
Cobaltoan Calcite: (Ca,Co)CO3; Pink Dolomite (or Thulite): CaMg(CO3)2 or Mn-Dolomite / (Thulite: Mn2+3Al2(Si2O7)(SiO4)O(OH))
Mineral / Rock (depending on purity)
Quartz
Silicon Dioxide (SiO₂)
Mineral
Prasiolite and Quartz Crystal Cluster
Quartz (SiO2); Prasiolite is a variety of Quartz
mineral
Included Quartz Beads (likely Phantom Quartz or Garden Quartz)
Quartz (SiO2) with various mineral inclusions
Mineral
Fired Clay Brick (Anthropic Rock substitute)
Anthropogenic polycrystalline ceramic (predominantly Mullite and Quartz: Al6Si2O13 + SiO2)
metamorphic (man-made / anthropic)
Calcite (likely a tumbled specimen)
Calcite (CaCO 3 )
Mineral
Calcite
Calcite (CaCO3)
Mineral
Peridot and Citrine Gemstones (in a ring setting)
Peridot (Olivine: (Mg,Fe)2SiO4), Citrine (Quartz: SiO2)
mineral
Quartz (variety of colors)
SiO2 (Silicon Dioxide)
Mineral
Aquamarine and clear quartz
Aquamarine (Be3Al2Si6O18), Quartz (SiO2)
Mineral
Jasper and Aquamarine (likely)
Jasper (Cryptocrystalline Quartz (SiO2)), Aquamarine (Beryl (Be3Al2Si6O18))
Sedimentary (Jasper), Mineral (Aquamarine)
Mixed Chalcedony and Jasper Bracelet (possibly 'Ocean Jasper' or similar banded variety for brown beads, and blue/grey Chalcedony for the translucent beads)
Chalcedony (SiO2), Jasper (SiO2 with impurities)
Mineral (specifically a cryptocrystalline variety of Quartz)
Jasper (Wonderstone/Banded Jasper)
Silicon Dioxide (SiO2) with iron oxide impurities
sedimentary (chemical/biological origin) or volcanic-related metamorphic
Calcite (or Alabaster, if truly carved)
Calcium Carbonate (CaCO3)
Mineral/Rock
Quartz Vein in Host Rock
Silicon Dioxide (SiO2)
mineral with metamorphic or sedimentary host
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)
Chert or Flint (polished/water-worn)
Chert (a microcrystalline or cryptocrystalline variety of quartz, SiO2). Flint is a specific variety of chert.
Sedimentary (most likely, as Chert is a sedimentary rock often found as nodules in limestone or as bedded deposits; however, it can also form by metasomatic replacement, which leans towards metamorphic processes under certain conditions)
Lapis Lazuli (blue bead) and Moss Agate (green heart)
Lapis Lazuli (lazurite-based rock) and Moss Agate (SiO2 with manganese/iron inclusions)
metamorphic (Lapis) and sedimentary/igneous assoc. (Moss Agate)
Green Slag Glass (Cullet)
Amorphous Silica (Industrial Glass Byproduct)
Synthetic/Byproduct (Non-igneous, non-sedimentary, non-metamorphic)
Fossiliferous Limestone (Red Marble)
Bioclastic Limestone (CaCO3)
sedimentary
Limestone
Calcareous Sedimentary Rock (CaCO3)
sedimentary
Pyrite in Matrix (often with Chalcopyrite)
Iron Sulfide (FeS2) / Copper Iron Sulfide (CuFeS2)
mineral
Pyrite with Iron Oxides (Fool's Gold in Matrix)
Iron Sulfide (FeS2)
mineral
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Blue Kyanite
Kyanite (Al2SiO5)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Specular Hematite
Iron Oxide (Fe2O3)
mineral
Calcite (Iceland Spar)
Calcite (Calcium Carbonate, CaCO3)
mineral
Specular Hematite (Specularite)
Iron Oxide (Fe2O3)
mineral
Green Kyanite
Kyanite (Al2SiO5)
mineral
Specular Hematite (Specularite)
Iron Oxide (Fe2O3)
mineral
Blue Kyanite in Quartz
Kyanite (Al2SiO5)
mineral
Pyrite (on Quartz matrix)
Iron Sulfide (FeS2)
mineral
Magnetite (likely with weathered Limonite/Hematite)
Magnetite (Fe3O4) with iron oxide weathering
mineral
Picture Jasper
Silicon Dioxide (SiO2) with mineral inclusions
sedimentary
Anthracite
Anthracite Coal (C)
sedimentary
Rhodolite Garnet
Magnesium Aluminum Silicate; formula: (Mg,Fe)3Al2(SiO4)3
mineral
Blue Kyanite
Kyanite (Al2SiO5)
mineral
Anthracite
Anthracite Coal
sedimentary