Green Jasper
Silicon Dioxide (SiO2) with iron silicate inclusions
sedimentary
Category
Man Made
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Jasper (likely Iron-stained)
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Granite
Phaneritic plutonic rock (Quartz, Feldspar, Mica)
igneous
Fluorite
Calcium Fluoride (CaF2)
Mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Yellow Fluorite
Calcium fluoride (CaF2)
mineral
Potassium Feldspar
Orthoclase (KAlSi3O8)
mineral
Smoky Quartz Cluster
Silicon Dioxide (SiO2)
mineral
Amygdaloidal Basalt
Basalt with secondary mineral infilling
igneous
Hematite
Iron(III) oxide (Fe2O3)
mineral
Cream Quartz Bead
Silicon Dioxide (SiO2)
mineral
River Pebble (Greywacke or Basaltic)
Massive Greywacke or Basaltic Andesite
sedimentary or igneous
Jasper Agate (specifically Brecciated Jasper)
Silicon Dioxide (SiO2) with iron oxide and clay impurities
sedimentary
Coral (Precious Coral)
Corallium rubrum (Red Coral), Paracorallium japonicum (Momo Coral), Pleurocorallium elatius (Sardinian Coral), various other species within the Corallidae family. Chemically, it's primarily Calcium Carbonate (CaCO 3 ).
Mineral, Organic Gemstone
Jadeite
NaAlSi2O6; Jadeite silicate mineral
metamorphic
Carnelian
Carnelian Agate (SiO2)
gemstone
Quartzite River Rock
Quartzite
metamorphic
Chalcedony Pebble
Cryptocrystalline Quartz (SiO2)
mineral
Sandstone
Arenite
sedimentary
Sandstone (Pebble/Conglomerate fragment)
Sandstone (clastic sedimentary rock)
Sedimentary Rock
Olivine (Peridot)
Olivine Group (Mg,Fe)2SiO4
mineral
Banded Gneiss
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Sandstone
Arenite
sedimentary
Sedimentary Sandstone with Iron Oxide
Ferruginous Sandstone
sedimentary
Fossilized Horn Coral
Order Rugosa (Rugose Coral)
sedimentary
Chert Arrowhead
Microcrystalline Quartz (SiO2)
sedimentary
Iron-Nickel Meteorite fragment
Siderite (meteoritic iron), composed primarily of Kamacite (α-(Fe,Ni)) and Taenite (γ-(Fe,Ni))
mineral
Granite
Granite (a common rock type, not a single mineral; composed primarily of Quartz, Feldspar (Orthoclase and Plagioclase), and Mica (Biotite and/or Muscovite) and/or Amphibole)
Igneous
Quartzite
Quartzite (SiO2)
metamorphic
Sandstone (Iron-stained)
Arenite (primarily SiO2 with Fe2O3 staining)
sedimentary
Hematite (Iron Ore)
Hematite (Fe2O3)
mineral
Carnelian Agate
Silicon Dioxide (SiO₂), a variety of Chalcedony
mineral
River Rock (Granitic Gneiss)
Foliated Granitic Gneiss
metamorphic
Red Jasper
Jasper (Silicon Dioxide with Iron Oxide inclusions), SiO2
sedimentary
Red Jasper
Silicon Dioxide (SiO2)
sedimentary
Chert (Chert / Flint nodule)
Silicon Dioxide (SiO2)
sedimentary
Fluorite in Matrix
Calcium Fluoride (CaF2) with Quartz/Calcite matrix
mineral
Rough Black Diamond (Bort / Carbonado)
Diamond (C)
mineral
Zebra Jasper
Banded microcrystalline quartz (SiO2)
sedimentary
Quartz with Matrix
Silicon Dioxide (SiO2)
mineral
Green Fluorite (Botryoidal/Massive)
Calcium Fluoride (CaF2)
mineral
Rugose Coral (Horn Coral)
Order Rugosa (extinct fossilized coral)
sedimentary