Quartz (likely)
Quartz (SiO2 - Silicon Dioxide)
Mineral
Category
Sedimentary Or Metamorphic Derived
Browse sedimentary or metamorphic derived specimens identified by the Rock Identifier community.
Garnet (likely Almandine, Pyrope, or a blend)
Garnet group minerals: X3Y2(SiO4)3, where X and Y represent various metal ions (e.g., Almandine: Fe3Al2(SiO4)3, Pyrope: Mg3Al2(SiO4)3)
Mineral
Agate (various color varieties)
SiO₂ (Silicon Dioxide)
Mineral (specifically a variety of Chalcedony, which is a microcrystalline quartz)
Banded Gneiss (Variety of Gneiss)
Gneiss (specifically, a variety exhibiting prominent banding; mineral composition can vary, but often contains quartz, feldspar, mica, and amphibole)
Metamorphic Rock
Banded Gneiss (River Rock/Pebble)
Gneiss (specifically a banded variety, likely a orthogneiss or paragneiss depending on parent rock)
Metamorphic Rock
Quartz
Silicon Dioxide (SiO2)
Mineral
Quartz (Float/Abraded)
Quartz (SiO₂)
Mineral
Pyrite
Iron Pyrite (FeS2)
mineral
Fluorite Bracelet (light green beads) and possibly Lavender Jadeite (purple bead)
Fluorite: CaF₂ (Calcium Fluoride); Jadeite: NaAlSi₂O₆ (Sodium Aluminum Silicate)
Mineral for Fluorite; Mineral/Rock for Jadeite (as it's often a rock composed primarily of jadeite mineral)
Quartz
Quartz (SiO₂)
Mineral
Calcite
Calcite (Mineral; CaCO₃)
Mineral
Dendritic Agate (or Dendritic Opal)
SiO2 (for Agate), SiO2·nH2O (for Opal)
Mineral
Pebble (likely Sandstone or Granitic Pebble)
Clastic Sediment (or specific rock type, e.g., Arenite, Granitoid Pebble)
Rock (likely Sedimentary)
Yellow Chalcedony
Chalcedony (a cryptocrystalline variety of Quartz, SiO₂)
Mineral
Smoky Quartz
SiO2 (Silicon Dioxide)
Mineral
Amethyst
Quartz (SiO2) variety
Mineral
Calcite
Calcite (CaCO 3)
Mineral
Gneiss
Gneiss (pronounced 'nice')
Metamorphic Rock
Quartz (chalcedony variety) or Limestone with Quartz Veins
SiO2 (for Quartz/Chalcedony); CaCO3 (for Limestone)
Mineral or Sedimentary Rock (with mineral inclusions)
Calcite
Calcite (Mineral, Calcium Carbonate - CaCO3)
Mineral
Quartz (on matrix)
Quartz (Silicon Dioxide, SiO₂)
Mineral
Included Quartz Beads (likely Phantom Quartz or Garden Quartz)
Quartz (SiO2) with various mineral inclusions
Mineral
Quartzite
Quartzite (primarily composed of SiO O₂)
Sedimentary Rock
Milky Quartz
Quartz (SiO₂)
Mineral
Quartz (Crystal/Druzy Quartz)
Quartz (SiO₂)
Mineral
Banded Gneiss
Gneiss (pronounced "nice")
Metamorphic Rock
Ocean Jasper (Orbicular Jasper)
Silicon Dioxide (SiO2) with various inclusions
sedimentary (geologically classified as a variety of chalcedony/quartz)
Sodalite
Sodalite (Na4Al3Si3O12Cl)
Mineral
Zircon
Zircon (ZrSiO4)
Mineral
Quartz
Quartz (SiO2)
Mineral
Orange Calcite
Calcite (CaCO3)
Mineral
Muscovite Mica
Muscovite (KAl2(AlSi3O10)(OH)2)
Mineral
Magnetic Hematite
Magnetized Hematite (an iron oxide mineral, Fe2O3, that has undergone magnetization)
Mineral
Veined Pebble (likely a Quartz-Veined Pebble)
Pebble with Mineral Vein (e.g., Quartz Vein in a Chert/Mudstone Pebble)
Sedimentary Rock (possibly conglomerate or breccia with a quartz vein)
Amethyst
SiO2 (Silicon Dioxide)
Mineral
Jasper (with orbicular/unakitoid tendencies)
Silicon Dioxide (SiO2) with iron and epidote inclusions
sedimentary (chemically precipitated) or metamorphic
Geode with Quartz and possibly Jasper/Hematite
Quartz (SiO2) and Chalcedony (cryptocrystalline SiO2), possibly stained by iron oxides
Mineral/Sedimentary Geode
Quartz (in matrix)
Quartz (SiO₂)
mineral
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
Quartz (milky quartz variety)
Quartz (SiO₂)
Mineral