Rough Emerald
Beryl (Be3Al2Si6O18 with Chromium/Vanadium impurities)
mineral
Category
Metamorphic (Localized) Or Sedimentary
Browse metamorphic (localized) or sedimentary specimens identified by the Rock Identifier community.
Marble
Marble (metamorphosed limestone/dolostone). Predominantly composed of Calcite (CaCO3) for marble derived from limestone, or Dolomite (CaMg(CO3)2) for marble derived from dolostone.
Metamorphic Rock
Graphite-veined Quartzite
Meta-sedimentary Quartzite with Carbonaceous/Graphitic Inclusions (SiO2 + C)
metamorphic
Clear Quartz
Quartz (Silicon Dioxide, SiO2)
Mineral
Pyrite
Pyrite (FeS2)
Mineral
Blue Quartzite
Quartzite (specifically a variety enriched with blue-coloring minerals)
Metamorphic Rock
Greenstone / Chert
Cryptocrystalline Quartz (SiO2) or Altered Basalt
sedimentary or metamorphic
Milky Quartz
Quartz (Silicon Dioxide - SiO2)
mineral
Calcite (Yellow/Orange variety - sometimes called Honey Calcite)
Calcite
Mineral
Graphite
Graphite (Carbon, C)
Mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Quartz
Silicon dioxide (SiO2)
Mineral
Clear Quartz (Rock Crystal)
Quartz (SiO₂)
Mineral
River Stone / Pebble
Clastic Sediment (composed largely of Quartz, Feldspar, and various rock fragments)
Mineral, Sediment
Quartz (likely a weathered/tumbled piece)
Quartz (SiO₂)
Mineral
Quartz
SiO₂ (Silicon Dioxide)
Mineral
Quartz
Quartz (SiO₂)
Mineral
Banded Gneiss
Gneiss (pronounced 'nice')
metamorphic
Slate
Slate (a fine-grained, foliated metamorphic rock). Mineral composition: Primarily composed of mica minerals (muscovite, chlorite, sericite) and quartz, with minor amounts of hematite, pyrite, and other accessory minerals.
sedimentary
Red Jasper (Brecchiated Jasper)
Silicon Dioxide (SiO2) with Hematite impurities
Sedimentary / Mineral
Ocean Jasper
Orbicular Jasper (Silicon Dioxide, SiO2)
sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Iron Oxide inclusions
mineral
Jasper with Iron Staining
Silicon Dioxide (SiO2) with Hematite (Fe2O3)
sedimentary
Marble
Marble (primarily Calcite, CaCO3 or Dolomite, CaMg(CO3)2)
Metamorphic Rock
Greenstone / Glauconitic Siltstone
Metabasalt or Glauconite-rich Sedimentary Rock
metamorphic or sedimentary
Quartz (likely a clear or rock crystal variety)
Quartz (SiO2 - Silicon Dioxide)
Mineral
Hematite
Hematite (Fe2O3)
mineral
Jasper and Quartzite Pebble
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary/metamorphic
Mica Group Minerals
There isn't a single scientific name as 'Mica' refers to a group of phyllosilicate minerals. Common scientific names include Muscovite (KAl₂ (AlSi₃O₁₀)(OH)₂), Biotite (K(Mg,Fe)₃AlSi₃O₁₀(OH)₂), Phlogopite (KMg₃AlSi₃O₁₀(OH)₂), and Lepidolite (K(Li,Al)₃(Al,Si,Rb)₄O₁₀(F,OH)₂).
Mineral
Shale or Argillite
Shale (fine-grained clastic sedimentary rock) or Argillite (low-grade metamorphic rock derived from shale)
Sedimentary or Metamorphic (low grade)
Banded Chert / Banded Jasper (likely a variety of Chert/Chalcedony)
Chert (microcrystalline quartz)
Metamorphic Rock
Mixed Quartz and River Pebbles (Stone Collection)
Mixed assortment containing mainly Silicon Dioxide (SiO2)
igneous, sedimentary, metamorphic, and mineral
Pyrite
Pyrite (Iron Disulfide), FeS2
Mineral
Quartz Pebble
Silicon Dioxide (SiO2)
Mineral / Sedimentary
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Quartz (likely Milky Quartz or Chalcedony)
Quartz (SiO2 - Silicon Dioxide)
Mineral
River Pebbles and Quartz
Mixed Igneous, Sedimentary, and Metamorphic Rocks (Silicon Dioxide SiO2 dominant)
mixed
Quartz
Quartz (SiO₂ - Silicon Dioxide)
Mineral
Quartz
Quartz (SiO₂)
mineral
Milky Quartz
Quartz (SiO2)
Mineral
Pyrite
Pyrite (Iron sulfide, FeS₂)
mineral
Hematite
Hematite (Fe2O3)
mineral