Quartz / Rock Crystal
Silicon Dioxide (SiO2)
mineral
Category
Not A Rock
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Scoria (Lava Rock)
Scoria (Vesicular Basalt)
igneous
Granite
Granite (Felsic Plutonic Rock)
igneous
Ferruginous Sandstone
Ferruginous Clastic Sedimentary Rock
sedimentary
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Sedimentary Breccia
Breccia (Clastic Sedimentary Rock)
sedimentary
Mixed collection of Quartz varieties, Chalcedony, and metamorphic pebbles
Mixed gemstones (primarily Silicon Dioxide - SiO2)
mineral
Sandstone
Arenite (SiO2 variety)
sedimentary
Dalmatian Stone
Dalmatian Jasper (not a true jasper, typically an igneous perthite)
igneous
Sandstone (with man-made markings)
Arenite (composed primarily of Quartz, SiO2)
sedimentary
Felsic Tuff
Pyroclastic volcanic rock (Tuff)
igneous
Scoria (Vesicular Basalt)
Scoria (Extrusive Igneous Rock)
igneous
Schist
Crystalline Metamorphic Rock (Schistose)
metamorphic
Diorite
Diorite (intermediate intrusive igneous rock)
igneous
Granitic Gneiss
Gneiss (High-grade Metamorphic Rock)
metamorphic
Porphyritic Basalt
Aphanitic-porphyritic mafic volcanic rock
igneous
Gneiss (Granitic Gneiss)
Gneiss (composed primarily of Quartz, Feldspar, and Mica/Amphibole)
metamorphic
Gneiss (Metamorphic Rock)
Gneiss
metamorphic
Greenish Metamorphic Rock (likely containing epidote or chlorite)
Metamorphic rock, possibly epidosite or greenstone
Metamorphic
Granite
Granite (a common igneous rock)
igneous
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Sandstone (Pebble)
Arenite (primarily SiO2)
sedimentary
Limestone
Calcareous Sedimentary Rock (CaCO3)
sedimentary
Granitic Gneiss
Felsic Polycrystalline Gneiss
metamorphic
Serpentinite
Serpentinite (composed primarily of Serpentine group minerals like Antigorite, Lizardite, or Chrysotile)
metamorphic
Serpentine (variety: Serpentine Rock)
Antigorite, Lizardite, or Chrysotile; formula generally (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4
metamorphic
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Mixed Quartz and River Pebbles (Stone Collection)
Mixed assortment containing mainly Silicon Dioxide (SiO2)
igneous, sedimentary, metamorphic, and mineral
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Amethyst
Quartz (Silicon Dioxide with Iron impurities), SiO2
mineral
Ironstone Concretion
Ironstone (Siderite/Limonite/Goethite)
sedimentary
Amygdaloidal Basalt
Basalt (Igneous Volcanic Rock with secondary mineral infilling)
igneous
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Septarian Nodule
Septarian concretion (Calcite, Aragonite, and Limestone)
sedimentary
Emerald in Matrix
Beryl (Be3Al2Si6O18) with Chromium/Vanadium impurities
mineral
Chalcedony (Agate)
Quartz (Silicon Dioxide, SiO2)
mineral
Porphyry
Porphyritic Basaltic Andesite
igneous
Milky Quartz with Iron Inclusions
Silicon Dioxide (SiO2)
mineral
Chert (Yellow Jasper/Flint)
Silicon dioxide (SiO2) - Cryptocrystalline Quartz
sedimentary
Picture Jasper
Silicon Dioxide (SiO2)
sedimentary
Crinoid Stalk in Limestone
Crinoid fossil in Biomicrite (Limestone)
sedimentary