Sandstone (Ferruginous)
Arenite (primarily SiO2 with Fe2O3 staining)
sedimentary
Category
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Sandstone
Arenite (primarily SiO2)
sedimentary
Iron-stained Quartz
Silicon Dioxide with Iron Oxide (SiO2 + Fe2O3/FeO(OH))
mineral
Quartz (Vein Quartz)
Silicon Dioxide (SiO2)
mineral
Sandstone (likely Arkosic or Quartzose)
Arenite (SiO2 based with mineral inclusions)
sedimentary
Granite (with alteration)
Granite (Felsic intrusive igneous rock)
igneous
Sandstone (with Iron Siderite Concretion)
Arenite with Ironstone Concretion (FeCO3)
sedimentary
Quartz Druzy on Geode Fragment
Silicon Dioxide (SiO2)
mineral
Diorite
Diorite (Intermediate intrusive igneous rock)
igneous
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
Mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Rose Quartz
Silicon Dioxide (SiO2) with trace Titanium or Manganese
mineral
Agate (Crazy Lace or Eye Agate)
Silicon Dioxide (SiO2)
mineral
Asphalt (Road Aggregate)
Asphalt concrete / Bituminous mixture
anthropogenic sedimentary (technolith)
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Carnelian (Chalcedony)
Silicon Dioxide (SiO2)
mineral
Assorted Decorative Tumbled Stones (Quartz, Sodalite, Aventurine, Calcite)
Mixed Silicates and Carbonates (SiO2, Na8(Al6Si6O24)Cl2, CaCO3)
mineral
Almandine Garnet in Matrix
Almandine (Fe3Al2(SiO4)3)
metamorphic
Amygdaloidal Basalt
Vesicular Basalt with secondary mineral infilling (commonly Zeolite, Calcite, or Quartz)
igneous
Slate
Slate (foliated metamorphic rock)
metamorphic
Sandstone with Liesegang Rings
Arenite with Iron Oxide Concretions
sedimentary
Ferruginous Sandstone (Ironstone)
Clastic Sedimentary Rock (composed of SiO2 with Fe2O3/FeO(OH) cement)
sedimentary
Sandstone (Pebble/Conglomerate fragment)
Sandstone (clastic sedimentary rock)
Sedimentary Rock
Sandstone (with potential iron-oxide weathering)
Arenite (SiO2 based)
sedimentary
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Quartz Vein on Matrix
Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite (SiO2 based with mineral cement)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Schist with Quartz Vein
Mica Schist with Crystalline Quartz (SiO2)
metamorphic
Dark Igneous Rock (Likely Basalt or Diabase)
Basalt (extrusive igneous rock) or Diabase (intrusive igneous rock - also known as Dolerite), largely composed of plagioclase feldspar, pyroxene (augite), and sometimes olivine and amphibole. Exact mineralogy would require thin section analysis.
Igneous
Gneiss (Metamorphic Rock)
Gneiss
metamorphic
Quartzite
Quartzite (Primary mineral: SiO2)
metamorphic
Basalt with Quartz/Plagioclase Inclusions
Mafic volcanic rock (Basaltic)
igneous
Gemstone Sand (Mineral Assortment)
Mixed Mineral Concentrates (Commonly including Quartz SiO2, Garnet X3Y2(SiO4)3, and Tourmaline (Na,Ca)(Li,Mg,Al)3(Al,Fe,Mn)6(BO3)3(Si6O18)(OH,F)4)
mineral
Sandstone (Ferruginous)
Arenite (Fe2O3 stained)
sedimentary
Rose Quartz
Silicon dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Dyed Agate Geode (Pink/Magenta)
Silicon Dioxide (SiO2) - variety of Chalcedony/Quartz
mineral
Milky Quartz with Chlorite/Mica inclusions
Silicon Dioxide (SiO2) with inclusions
mineral
Quartz (Milky/Common)
Silicon Dioxide (SiO2)
mineral
Tree Agate
Dendritic Agate (Silicon Dioxide, SiO2)
Mineral
Carnelian Agate (with Quartz/Chalcedony)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
mineral