Quartzite Pebble
Quartzite (SiO2)
metamorphic
Category
Not A Geological Specimen
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Quartz with Mica/Host Rock
Silicon Dioxide (SiO2) with Phyllosilicates
mineral
Chert (specifically Tan/Gray Chert)
Microcrystalline quartz (SiO2)
sedimentary
Orange Quartz
Silicon Dioxide (SiO2) with Iron Oxide inclusions
mineral
Yellow Jasper
Silicon Dioxide (SiO2) with Goethite/Iron inclusions
sedimentary
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Pyrite in Matrix (often with Chalcopyrite)
Iron Sulfide (FeS2) / Copper Iron Sulfide (CuFeS2)
mineral
Quartz Vein in Host Rock
Silicon Dioxide (SiO2)
mineral
Quartzite Pebble
Quartzite (SiO2) with mineral inclusions
metamorphic
Sandstone (with Iron Staining)
Clastic sedimentary rock (primarily Quartz - SiO2)
sedimentary
Quartzite Pebbler
Quartzite (SiO2)
metamorphic
Calamites (Fossil Plant)
Calamites (Genus), belonging to the class Equisetopsida
sedimentary
Fossilized Horn Coral
Rugosa
fossil
Cassiterite in Iron-rich Matrix
Cassiterite (SnO2)
mineral
Libyan Desert Glass
Libyan Desert Glass (SiO2 with trace elements)
mineral (impactite)
Ammonite Fossil
Ammonoidea (typically preserved as Calcite CaCO3 or Pyrite FeS2)
sedimentary
Fossilized Horn Coral
Order Rugosa (Rugose Coral)
sedimentary
Basalt with Limonite stains
Extrusive mafic igneous rock; Limonite (FeO(OH)·nH2O)
igneous
Puddingstone
Conglomerate (Silicon Dioxide - SiO2 with various inclusions)
sedimentary
Wishing Stone with Quartz Veins
Quartzite or Quartz-veined Metamorphic Rock (composed mainly of SiO2)
metamorphic
Ironstone Concretion (Moqui Marble)
Iron Oxide Concretion (Fe2O3 / FeO(OH) mixed with SiO2)
sedimentary
Limonite-pseudomorph after Pyrite (Prophecy Stone)
Goethite and Limonite secondary minerals (FeO(OH)·nH2O) replacing Pyrite (FeS2)
mineral
River Pebble (Gneiss or Quartzite)
Metamorphic rock specimen (likely Gneiss or impure Quartzite)
metamorphic
Agate Geode
Silicon Dioxide (SiO2) - Microcrystalline Quartz
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Amethyst Geode (polished heart-cut)
Silicon Dioxide (SiO2) with iron impurities
mineral
Conglomerate
Clastic Sedimentary (Conglomerate)
sedimentary
Basalt with Secondary Mineralization (Likely Zeolites or Calcite)
Aphanitic mafic volcanic rock with secondary mineral inclusions (e.g., CaAl2Si3O10·3H2O for Scolecite)
igneous
Amber
Succinite (a specific common type) or Fossilized Tree Resin (C10H16O)
Mineraloid
Basalt with Amygdules
Amygdaloidal Basalt
igneous
Jasper
Silicon Dioxide (SiO2) with impurities
sedimentary
Emerald in Matrix
Beryl (Be3Al2Si6O18) with Chromium impurities
mineral
Labradorite
(Ca, Na)(Al, Si)4O8 (Plagioclase Feldspar)
mineral
Labradorite
(Ca, Na)(Al, Si)4O8 (Plagioclase Feldspar)
mineral
Diamond (set in jewelry)
Diamond (Carbon, C)
mineral
Granite River Rock
Phaneritic Felsic Igneous Rock (Granite)
igneous
Yellow Jasper
Silicon Dioxide (SiO2)
sedimentary
Quartzite
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
mineral
Granite
Phaneritic Felsic Igneous Rock
igneous
Chert (Field Stone/Pebble)
Microcrystalline or cryptocrystalline Quartz (SiO2)
sedimentary