Orthoclase (Potassium) Feldspar in Quartz
KAlSi3O8 (Potassium Aluminum Silicate)
igneous
Category
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Red Sandstone
Arenite (ferruginous sandstone)
sedimentary
Milky Quartz (with Iron Oxide staining)
Quartz (Silicon Dioxide - SiO2)
mineral
Clear Quartz (Crystal Quartz)
Silicon Dioxide (SiO2)
mineral
Graphic Granite (Zebra Rock)
Pegmatitic Granite (composed of Quartz and K-Feldspar)
igneous
Agate and Amethyst (Quartz variants)
Silicon Dioxide (SiO2) - Microcrystalline Quartz and Crystalline Quartz
mineral
Gneiss (specifically Micaceous Gneiss)
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Basalt with Quartz/Quartzite Veins
Aphanitic Mafic Volcanic Rock with Siliceous Infillings
igneous
Milky Quartz with Iron Inclusions
Quartz (Silicon Dioxide, SiO2)
mineral
Diorite
Phaneritic Intermediate Plutonic Rock (Diorite)
igneous
Diorite
Diorite (Intermediate intrusive igneous rock)
igneous
Granite
Granite
igneous
Red Scoria (Lava Rock)
Scoria (Vesicular Basalt/Andesite)
igneous
Sandstone Concretion
Sandstone (Sedimentary Rock) with silica or calcite cement
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Schist
Mica Schist (Quartz-Muscovite-Biotite Schist)
metamorphic
Red Brecciated Jasper
Silicon Dioxide (SiO2) with Hematite inclusions
sedimentary
Basalt
Basalt (Mafic volcanic rock)
igneous
Basalt
Basalt (Aphanitic-fine grained mafic igneous rock)
igneous
Sedimentary Breccia
Breccia (Clastic Sedimentary Rock)
sedimentary
Slag
Ferrous Slag (Amorphous calcium-magnesium-aluminum silicates)
igneous (artificial/anthropogenic)
Blue Sapphire
Corundum (Al2O3)
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Sandstone
Arenite
sedimentary
Quartz Pebble (Citrine-colored or Stained Quartz)
Silicon Dioxide (SiO2)
mineral
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Septarian Nodule Segment (Commonly known as Dragon Stone or Lightning Stone)
Septarian Nodule (CaCO3 / Hydrated Calcium Carbonate)
sedimentary
Dragon Stone
Ohko Stone (Argillaceous sedimentary rock)
sedimentary
Schist
Mica Schist
metamorphic
Gneiss (Granitic Gneiss)
Gneiss (from German Gneis, related to 'spark')
metamorphic
Amygdaloidal Basalt with Quartz/Zeolite Infill
Amygdaloidal Basalt (extrusive volcanic rock with SiO2 or CaAl2Si3O10·3H2O infill)
igneous
Rose Quartz
Silicon Dioxide with trace inclusions of dumortierite or titanium (SiO2)
mineral
Sandstone (with cross-bedding)
Arenite (composed primarily of Quartz: SiO2)
sedimentary
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Chalcedony (Botryoidal or Agate nodule)
Silicon Dioxide (SiO2)
mineral
Moqui Marble (Shaman Stone)
Iron Oxide Concretion (Goethite/Hematite shell with Sandstone core)
sedimentary
Gold
Native Gold (Au)
mineral
Blue Lace Agate (Tumbled)
Silicon Dioxide (SiO2)
mineral
Dendritic Agate (River Pebble)
Silicon Dioxide (SiO2) with Manganese or Iron oxide inclusions
mineral
Fire Agate
Silicon Dioxide (SiO2) with layers of Limonite/Goethite
mineral
Red Jasper
Jasper (a variety of Chalcedony, SiO₂ with iron oxide inclusions)
Mineral