Feldspathic Gneiss (Granite Gneiss)
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Category
Mineral_rock
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Banded Sedimentary Rock (Siltstone/Mudstone with concretion)
Siltstone with Ferruginous Banding
sedimentary
Petrified Wood
Silicified Wood (Silicon Dioxide - SiO2)
fossil
Sandstone (Red)
Arenite (composed primarily of SiO2)
sedimentary
Potassium Feldspar (Orthoclase)
KAlSi3O8
mineral
Copper slag or vesicular basalt with copper minerals
Industrial slag / Basaltic matrix with secondary copper minerals
igneous
Turtle Stone / Septarian Nodule (Fragment)
Septarian Concretion (Calcite, Aragonite, and Limestone)
sedimentary
Malachite or Chrysocolla on Host Rock
Cu2(CO3)(OH)2 (Malachite) or (Cu,Al)2H2Si2O5(OH)4 (Chrysocolla)
mineral
Sandstone (Ferruginous)
Arenite (Fe-rich)
sedimentary
Sandstone (likely Arkosic or Lithic)
Clastic Sedimentary Rock (SiO2 with accessory minerals)
sedimentary
Sandstone Concretion
Carbonate-cemented Sandstone Concretion
sedimentary
Gneiss
High-grade metamorphic rock (Gneiss)
metamorphic
Diorite
Diorite
igneous
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
mineral
Quartz in Matrix (possibly with Biotite or Hornblende)
Quartz (Silicon Dioxide, SiO2) in Granitic Matrix
igneous
Clear Quartz
SiO2 (Silicon Dioxide)
gemstone
Banded Gneiss (Variety of Gneiss)
Gneiss (specifically, a variety exhibiting prominent banding; mineral composition can vary, but often contains quartz, feldspar, mica, and amphibole)
Metamorphic Rock
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Chert
Chert (SiO2)
sedimentary
Quartz
Silicon Dioxide (SiO2)
mineral
Red Sandstone
Arenite (Ferruginous Sandstone)
sedimentary
Ferruginous Sandstone
Sandstone with Iron Oxide (Limonite/Goethite)
sedimentary
Olivine (Peridot)
Magnesium Iron Silicate ((Mg, Fe)2SiO4)
mineral
Quartz Mix and Feldspar Group
Silicon Dioxide (SiO2) and Potassium Alumino-silicates (KAlSi3O8)
mineral
Greenstone
Metabasalt / Chlorite-actinolite-epidote schist
metamorphic
Quartz (Iron-Stained / Yellow Quartz)
Silicon Dioxide (SiO2)
mineral
Red Sandstone
Arenite with Iron Oxide (Hematite) cement
sedimentary
Granodiorite
Granodiorite (intermediate plutonic rock)
igneous
Blue Apatite
Calcium phosphate mineral, Ca5(PO4)3(F,Cl,OH)
mineral
Limonite Concretion
Hydrated Iron(III) Oxide-Hydroxide (FeO(OH)wnH2O)
sedimentary
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Snowflake Obsidian
Volcanic Glass (SiO2 rich with Cristobalite inclusions)
igneous
Feldspar (likely Orthoclase or Plagioclase)
Tectosilicate Feldspar (KAlSi3O8 to (Ca,Na)(Al,Si)4O8)
mineral
Greenstone with Epidote or Quartz veins
Metabasalt (Greenstone facies)
metamorphic
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Gossan
Iron-rich regolith (mainly Limonite and Goethite, FeO(OH)·nH2O)
sedimentary
Quartz River Rock
Silicon Dioxide (SiO2)
mineral
Weathered granitic rock fragment
Granite, predominantly quartz–feldspar–mica assemblage
igneous
Chalcopyrite
CuFeS2
mineral
Feldspar
Triclinic or Monoclinic Tectosilicate (e.g., KAlSi3O8)
mineral
Green Fluorite
Fluorite (Calcium Fluoride, CaF2)
mineral
Chalcopyrite
Copper Iron Sulfide (CuFeS2)
mineral