Fish Fossil in Limestone
Lycoptera (likely) in Micritic Limestone
sedimentary
Category
Metamorphic Or Sedimentary Depending On Local Grade
Browse metamorphic or sedimentary depending on local grade specimens identified by the Rock Identifier community.
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Hag Stone
Flint / Chert / Limestone concretion with a natural hole
sedimentary
Calamites
Calamites (Pith cast fossil)
sedimentary
Aquamarine with Ruby Accent
Beryllium Aluminum Silicate (Be3Al2Si6O18) with Aluminum Oxide (Al2O3)
mineral
Geode (Unopened)
Chalcedony Geode (Hydrated Silicon Dioxide, SiO2)
sedimentary
Jasper (likely Polychrome or Mookaite variants)
Silicon Dioxide (SiO2) with iron oxide and hydroxide inclusions
sedimentary (chemically precipitated)
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Blue Quartz with Dumortierite/Magnesio-riebeckite inclusions
Quartz (SiO2) containing Dumortierite (Al7(BO3)(SiO4)3O3)
igneous/metamorphic
Anthracite Coal
Anthracite
metamorphic
Khondalite
Garnet-sillimanite-graphite schist/gneiss
metamorphic
Mica Schist
Mica Schist (primarily Muscovite and Quartz)
metamorphic
Epidosite
Epidosite (predominantly Epidote {Ca2Al2Fe3+Si3O12(OH)} and Quartz {SiO2})
metamorphic
Greenstone
Metabasalt (Greenstone facies)
metamorphic
Greenstone
Metabasalt / Greenstone
metamorphic
Blue Kyanite
Kyanite (Al2SiO5)
mineral
Rhodonite beads (possibly dyed or treated, or lower quality Rhodonite)
Manganese inosilicate, (Mn,Fe,Mg,Ca)SiO3
Mineral
Anthracite Coal
Anthracite (Carbon-rich metamorphic rock)
metamorphic
Garnet-bearing Quartzite
Metamorphic rock containing Almandine Garnet (Fe3Al2(SiO4)3) and Quartz (SiO2)
metamorphic
Greenstone (metamorphosed basalt)
Greenschist / Meta-basalt
metamorphic
Unakite
Unakite (Epidote-Feldspar rock)
Metamorphic rock
Black Star Diopside (beads)
Diopside (CaMgSi2O6) - a member of the pyroxene group
Mineral
Greenschist
Greenschist (containing Chlorite, Actinolite, and Epidote)
metamorphic
Ruby (Corundum)
Aluminum oxide (Al2O3) with Chromium traces
mineral
Mica Schist with Quartz
Mica Schist (primarily Muscovite or Biotite sheet silicates)
metamorphic
Greenstone
Greenschist / Meta-basalt
metamorphic
Schist
Mica Schist
metamorphic
Greenstone
Metabasalt / Chlorite-Epidote Schist
metamorphic
Glaucophane-bearing Schist (Blueschist)
Blueschist (Glaucophane-Lawsonite Schist)
metamorphic
Baltic Amber (Butterscotch or Egg Yolk Variety)
Succinite (chemical formula: C10H16O)
Organic Gemstone (not a rock or mineral)
Pumice or Tufa/Travertine
Pumice (if igneous) or Calcareous Tufa (if sedimentary)
igneous/sedimentary
Schist (Micaceous)
Mica Schist
metamorphic
Schist
Mica Schist
metamorphic
Schist
Crystalline Metamorphic Rock (Schistose)
metamorphic
Quartz (Pebble)
Quartz (SiO₂)
Mineral
Glaucophane Schist (Blueschist)
Blueschist facies metamorphic rock
metamorphic
Banded Gneiss (with possible weathered sulfide or iron staining)
Gneiss, potentially with iron oxide/hydroxide staining (e.g., limonite) or weathered sulfides
Metamorphic
Chert (Arrowhead)
Chert (SiO2)
sedimentary
Quartz
Quartz (SiO₂)
Mineral
Moqui Marble (Concretion)
Iron Oxide Concretion
sedimentary
Milky Quartz with Garnet/Hematite and Basalt
Silicon Dioxide (SiO2) with Almandine (Fe3Al2Si3O12) and Basalt
mineral
Red Jasper
Jasper (Microcrystalline Quartz, SiO2)
sedimentary
Green Aventurine
Quartz (SiO2) with Fuchsite inclusions
mineral