Honey Calcite
Calcium Carbonate (CaCO3)
mineral
Category
Not A Geological Specimen
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Epidosite
Epidosite (Metasomatic calcium-aluminum silicate rock)
metamorphic
Quartz (likely) or a Quartzite Pebble
Silicon dioxide (SiO2) for quartz. If it's quartzite, it's a metamorphic rock primarily composed of quartz.
Mineral, specifically a detrital grain
Quartz (Milky or Smoky Quartz)
Silicon Dioxide (SiO2)
mineral
Quartzite
Quartzite
metamorphic
Quartz (Iron-Stained or Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Khondalite
Garnet-Sillimanite-Graphite Gneiss
metamorphic
Quartz
Silicon Dioxide (SiO2)
Mineral
Porphyritic Basalt (with Augite Crystals)
Porphyritic Mafic Volcanic Rock (Fe-Mg Silicates)
igneous
Pyrite (Iron Pyrite)
Iron Sulfide (FeS2)
mineral
Green Quartz (Prasiolite)
Crystalline Silicon Dioxide (SiO2) with iron impurities
mineral
Clear Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Fuchsite
Chromium-bearing Muscovite - K(Al,Cr)2(AlSi3O10)(OH)2
mineral
Dragon Blood Jasper
Epidote-rich Quartzite (SiO2 with Ca2(Al,Fe)3(SiO4)3(OH))
metamorphic
Garnet
Garnet (X3Y2(SiO4)3)
mineral
Milky Quartz (Tumbled/Water-worn)
Silicon Dioxide (SiO2)
mineral
Granite Pebble
Granite (Phaneritic Igneous Rock)
igneous
Ferruginous Sandstone (Ironstone Nodules)
Ferruginous Sandstone with Limonite/Goethite coating (Fe2O3·H2O)
sedimentary
Basalt (Drill Core)
Mafic Volcanic Rock (Basalt)
igneous
Sandstone (Ferruginous/Red Sandstone)
Clastic sedimentary rock (primarily SiO2 with Fe2O3)
sedimentary
Chert with Calcite Veining
Microcrystalline Quartz (SiO2) with Calcium Carbonate (CaCO3) veins
sedimentary
Pegmatite containing Muscovite and Quartz
Granitic Pegmatite (SiO2 with KAl2(AlSi3O10)(OH)2)
igneous
Banded Iron Formation (Tiger Iron variant)
Banded Iron Formation (SiO2 + Fe2O3)
sedimentary
Chert Nodules in Limestone
Cryptocrystalline Quartz (SiO2) within Calcium Carbonate (CaCO3)
sedimentary
Fossiliferous Siltstone
Clastic Sedimentary Rock with Fossil Inclusions
sedimentary
Quartz Vein in Sandstone
Sandstone with Hydrothermal Quartz (SiO2)
sedimentary
Sunstone
Aventurine Feldspar ((Ca,Na)(Al,Si)4O8)
mineral
Basalt with Quartz/Quartzite Veins
Aphanitic Mafic Volcanic Rock with Siliceous Infillings
igneous
Chromium (Chrome)
Chromium (Cr)
mineral
Green Moss Agate
Agate (Silicon Dioxide - SiO2) with inclusions of hornblende or chlorite
mineral
Basalt with Caliche Crust
Aphanitic Mafic Igneous Rock with Calcium Carbonate (CaCO3) coating
igneous
Sandstone (Banded)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Amethyst (Faceted)
Amethyst (Silicon Dioxide with iron impurities, SiO2)
mineral
Jasper
Jasper (Silicate - SiO2)
sedimentary
Quartzite
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Labradorite
Labradorite (Ca, Na)(Al, Si)4O8
mineral
Quartz (Milky or Cloudy Quartz)
Quartz (Silicon Dioxide, SiO2)
mineral
Quartzite
Quartzite (SiO2)
metamorphic
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Yellow Jasper
Silicon Dioxide (SiO2) - Impure Cryptocrystalline Quartz
sedimentary