Mica Schist
Mica Schist (primarily muscovite and biotite)
metamorphic
Category
Man Made Object (Metalwork)
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Sandstone
Sedimentary Rock (Quartz arenite/Arkose)
sedimentary
Quartz
Silicon Dioxide (SiO2)
mineral
Green Fluorite
Fluorite (Calcium Fluoride, CaF2)
mineral
Clear calcite crystal fragment
Calcite (calcium carbonate, CaCO₃)
mineral
Calcite crystal fragment
Calcite (calcium carbonate, CaCO₃)
mineral
Agate (specifically, likely a geode slice or nodule)
Agate (a variety of Chalcedony, with chemical formula SiO2)
Mineral
Green Fluorite
Calcium Fluoride (CaF2)
mineral
Blue calcite (probable)
Calcite, CaCO₃
mineral
Sandstone
Arenite (primarily SiO2)
sedimentary
Sandstone with Iron Oxide Coating
Arenite (SiO2 with Fe2O3 impurities)
sedimentary
Dark green metamorphic rock, likely serpentinite
Serpentinite, composed mainly of serpentine-group minerals (antigorite, lizardite, or chrysotile), commonly with magnetite and minor chlorite/talc
metamorphic
Tumbled dark green stone, likely serpentine or greenstone
Serpentinite (hydrated magnesium silicate minerals, chiefly antigorite/lizardite); possible chlorite-rich greenstone
metamorphic
Fossilized Gastropod / Coral
Phylum Mollusca / Cnidaria (Silicified or Calcified)
fossil
Pegmatite
Igneous Pegmatite
igneous
Concretion in Shale
Siltstone/Shale with Siderite or Calcareous concretions
sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Hematite (Fe2O3)
sedimentary
Granodiorite
Granodiorite
igneous
Quartzite
Quartzite (mostly SiO2)
metamorphic
Hag Stone
Perforated Sedimentary Rock (typically Limestone or Sandstone)
sedimentary
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Satin Spar (Selenite)
Gypsum (Calcium Sulfate Dihydrate) - CaSO4·2H2O
mineral
Chert (specifically Flint)
Microcrystalline quartz (SiO2)
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Small seashell fossil or shell fragment
Likely calcium-carbonate shell material, chiefly aragonite or calcite; exact species indeterminate
fossil
Moonstone
Orthoclase and Albite (KAlSi3O8 / NaAlSi3O8)
gemstone
Carnelian
Carnelian (Cryptocrystalline Quartz, SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Banded Agate
Cryptocrystalline Silica (SiO2)
mineral
Chert (Limestone-based)
Silicon dioxide (SiO2)
sedimentary
Fossilized Coral
Scleractinia (fossil order), primarily Calcium Carbonate (CaCO3)
sedimentary
Chert (Yellow Jasper/Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Red Jasper
Silicate (SiO2 with Hematite impurities)
sedimentary
Chert (Flint)
Chert (Cryptocrystalline Quartz, SiO2)
sedimentary
Chert (Chalcedony/Agate)
Microcrystalline Quartz (SiO2)
sedimentary
Vesicular Basalt (Lava Rock)
Basalt (Vesicular Variety)
igneous
Pumice
Pumice (Vesicular volcanic glass)
igneous
Tumbled pale quartz/chalcedony fragment
Quartz (SiO₂), possibly microcrystalline chalcedony
mineral
Likely tumbled calcite or pale limestone fragment
Calcite (CaCO₃), possibly microcrystalline limestone
mineral
Sunstone (Heliolite)
Plagioclase Feldspar ((Ca,Na)(Al,Si)4O8)
mineral
Iron-rich quartzite or ferruginous metamorphic rock
Quartzite, predominantly SiO₂, stained by iron oxides (hematite/goethite)
metamorphic
Red Scoria
Vesicular Basaltic Andesite
igneous