Spessartine Garnet in Quartz/Feldspar Pegmatite
Spessartine (Mn3Al2(SiO4)3) in Quartz (SiO2) and Feldspar
Mineral in Igneous Rock
Category
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Red Sandstone
Sedimentary Quartz Arenite / Arkose
sedimentary
Banded Sandstone
Arenite with Liesegang banding (primarily SiO2 with FeO(OH) impurities)
sedimentary
Banded sandstone pebble
Quartz-rich lithic sandstone; exact provenance and composition require testing
sedimentary
Basalt with Quartz Vein
Basalt with silicon dioxide (SiO2) inclusion
igneous
Granite
Intrusive Igneous Rock (Felsic)
igneous
Small brown-gray mineral fragment
Indeterminate; possibly weathered quartz-, feldspar-, or iron-oxide-bearing rock
mineral
Sandstone
Arenite
sedimentary
Sandstone (Tumbled/River Pebble)
Arenite (composed primarily of SiO2)
sedimentary
Sandstone
Sedimentary Rock (Quartzose Sandstone)
sedimentary
Sandstone (Iron-stained)
Arenite (primarily SiO2 with Fe2O3 staining)
sedimentary
Basalt with Quartz/Calcite Veins
Basalt with hydrothermal vein infill
igneous
Druzy Quartz on Chert/Siltstone
Silicon Dioxide (SiO2) on Microcrystalline Silica/Siltstone matrix
sedimentary
Sandstone with Mineral Veining or Crust
Sedimentary Sandstone (mostly SiO2 with Fe2O3 tinting)
sedimentary
Quartz Geode
Silicon Dioxide (SiO2) in Geodic habit
mineral
Sandstone (River Rock)
Arenite (composed primarily of SiO2)
sedimentary
Sandstone
Sedimentary Rock (Quartz arenite)
sedimentary
Septarian Nodule
Septarian Concretion (CaCO3 with Siderite/Limonite streaks)
sedimentary
Serpentine
Antigorite, Lizardite, or Chrysotile (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4
metamorphic
Sandstone (Ferruginous)
Arenite (SiO2 with iron oxide impurities)
sedimentary
Granite
Intrusive igneous rock (Felsic)
igneous
Granite
Intrusive Igneous Rock
igneous
Granite
Intrusive Igneous Rock
igneous
Schist
Schist
Metamorphic
Conglomerate
Conglomerate Rock
sedimentary
Granite
Granite
Igneous
Gneiss
Gneiss (Metamorphic Rock)
metamorphic
Gneiss
Gneiss (Metamorphic Rock)
metamorphic
Limonite Concretion
Limonite (FeO(OH)·nH2O) Pseudomorph
sedimentary
Milky Quartz (Quartz Vein)
Silicon Dioxide (SiO2)
mineral
Coal (Bituminous / Anthracite)
Organic Sedimentary Rock (Carbonaceous Rock)
sedimentary
Gneiss
Gneiss
metamorphic
Quartz Druzy Geode
Silicon Dioxide (SiO2) - Crystalline Variety
mineral
Decorative polished pebbles
Likely mixed quartz-rich lithologies, including quartzite, jasper, and/or basalt
mineral
Quartz (Druzy)
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Veined Grey Metamorphic Pebble
Quartzo-feldspathic vein in Metabasalt / Serpentinite / Slate
metamorphic
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Limonite (Iron Ore)
FeO(OH)·nH2O (Hydrous ferric oxide)
mineral
Basalt
Basalt (Mafic Extrusive Igneous Rock)
igneous
Granite
Intrusive Igneous Rock (Felsic)
igneous
Basalt with Quartz/Calcite Veining
Basalt (principally Plagioclase and Pyroxene)
igneous