Orthoclase Feldspar
Potassium Aluminum Silicate (KAlSi3O8)
mineral
Category
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Quartz Vein in Gneiss or Basalt
Milky Quartz (SiO2) within Metamorphic Host Rock
Metamorphic or Igneous with Mineral Inclusion
Geode (Quartz / Chalcedony Geode)
Silicon Dioxide (SiO2) - Quartz / Chalcedony
sedimentary
Snowflake Obsidian
Volcanic Glass (SiO2) with Cristobalite inclusions
igneous
Granite
Phaneritic Igneous Rock (primarily Quartz, Feldspar, and Mica)
igneous
Sandstone Cobble
Arenite (Sandstone)
sedimentary
Satin Spar (Gypsum)
Hydrous Calcium Sulfate (CaSO4·2H2O)
mineral
Ferruginous Sandstone
Arenite with Iron-oxide cement (composed of Quartz and Limonite/Hematite)
sedimentary
Amygdaloidal Basalt
Vesicular Basalt with secondary mineral infilling (commonly Zeolite, Calcite, or Quartz)
igneous
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Diorite (River Rock/Cobble)
Intermediate Plutonic Igneous Rock (Diorite)
igneous
Diorite
Diorite (Intermediate intrusive igneous rock)
igneous
Sodalite
Na8(Al6Si6O24)Cl2 (Sodium Aluminum Silicate Chloride)
mineral
Unidentified dark pebble
Undetermined; possibly polished basalt, chert, or iron-rich stone
mineral
Gneiss (with Quartz-Feldspar vein)
Gneiss (high-grade metamorphic rock) containing Quartz (SiO2) and Feldspar (KAlSi3O8 – NaAlSi3O8 – CaAl2Si2O8)
metamorphic
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Quartz (Iron-Stained Quartz)
Silicon Dioxide (SiO2)
mineral
Milky Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Chalcedony (Common Opal variant or Agate pebble)
Silicon dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Rose Quartz
Silicon Dioxide (SiO2) with Trace Inclusions
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Banded Agate (specifically Botswana Agate or Water-line Agate)
Chalcedony (cryptocrystalline variety of Quartz), SiO2
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartz Geode
Silicon Dioxide (SiO2) - Crystalline Quartz
mineral
Moss Agate
Chalcedony (Silicon Dioxide / SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Lapis Lazuli
Lapis Lazuli (Complex silicate rock containing Lazurite: (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2)
metamorphic
Gneiss (Banded Gneiss)
Gneiss
metamorphic
Bauxite
Bauxite (Al(OH)3 mixed with Fe2O3 and clay minerals)
sedimentary
Granite
Granite (a felsic intrusive igneous rock)
Igneous Rock
Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Granite
Phaneritic Felsic Igneous Rock
igneous
Quartz (Quartz Pebble)
Silicon Dioxide (SiO2)
mineral
Granite
Granite (Phaneritic Igneous Rock)
igneous
Biotite-rich gneiss (probable)
Foliated quartz–feldspar–biotite gneiss; composition commonly includes quartz (SiO₂), feldspar, and biotite mica
metamorphic
Almandine Garnet in Matrix
Almandine (Fe3Al2(SiO4)3)
metamorphic
Vesicular basalt (scoriaceous basalt)
Basalt, primarily plagioclase, pyroxene, and iron-rich olivine; vesicular variety may be termed scoria
igneous
Gneiss (specifically Granite Gneiss)
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Basalt River Cobble
Basalt (Aphanitic extrusive mafic igneous rock)
igneous