Sandstone (with Iron Staining)
Clastic sedimentary rock (primarily SiO2 with Fe2O3 oxides)
sedimentary
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Sandstone (Banded Sandstone)
Clastic Sedimentary Rock (primarily SiO2 with iron oxide impurities)
sedimentary
Red Sandstone (with possible iron oxide staining)
Sandstone (primarily Quartz with Hematite/Goethite cement)
sedimentary
Gneiss (with Quartzite and Biotite)
Gneiss containing SiO2 (Quartz), K(Mg,Fe)3AlSi3O10(OH)2 (Biotite), and (K,Na,Ca)AlSi3O8 (Feldspar)
metamorphic
Quartz (Milky Quartz vein fragment)
Silicon Dioxide (SiO2)
mineral
Granite
Granite (composed primarily of Quartz, Feldspar, and Mica/Amphibole)
igneous
Sandstone (with Limonite staining)
Arenite (primarily SiO2 with FeO(OH)·nH2O)
sedimentary
Dyed Dalmatian Stone
Aplite (Alkali-feldspar granite) with Arfvedsonite
igneous
Ironstone Concretion (Ironstone Gourd)
Limonite/Goethite Concretion (FeOO(H))
sedimentary
Granite
Granite (Felsic Plutonic Rock)
igneous
Quartzite with Hematite staining
Quartzite (SiO2) with iron oxide inclusions
metamorphic
Shale
Fissile Siliciclastic Sedimentary Rock
sedimentary
Banded Gneiss with Quartz Vein
Gneiss containing SiO2 (Quartz) intrusion
metamorphic
Gneiss
Gneiss (Metamorphic Rock)
metamorphic
Gneiss
Gneissic Metamorphic Rock (Mineral composition: Quartz, Feldspar, Amphibole/Biotite)
metamorphic
Porphyritic Basalt (with Pyrolusite or Iron-oxide staining)
Porphyritic Basalt (Mafic Extrusive)
igneous
Granite
Phaneritic Plutonic Felsic Rock
igneous
Sandstone (with possibly iron oxides and other minerals)
Sandstone
Sedimentary rock
Granite
Granite
Igneous
Granite
Phaneritic Igneous Rock (Granite)
igneous
Sandstone (Picture Sandstone)
Arenite (primarily SiO2)
sedimentary
Limonite (often after Pyrite)
Limonite (FeO(OH)·nH2O)
mineral
Sandstone
Arenite (SiO2 principal)
sedimentary
Sandstone
Arenite (SiO2 based with various mineral cements)
sedimentary
Banded Gneiss
Gneiss (Metamorphic Rock)
metamorphic
Shale
Shale (clastic sedimentary rock)
sedimentary
![Glauconite (Glauconitic Sandstone) (Glauconite [(K,Na)(Fe,Al,Mg)2(Si,Al)4O10(OH)2]) — sedimentary](https://media.rockidentification.com/ddee2737-ce89-4667-b94a-33db09e38765-thumbnail.jpg)
Glauconite (Glauconitic Sandstone)
Glauconite [(K,Na)(Fe,Al,Mg)2(Si,Al)4O10(OH)2]
sedimentary
Druzy Quartz Geode (Oco or Moroccan variety)
Silicon Dioxide (SiO2)
mineral
Granite or Granitic Gneiss River Rock
Granite / Gneiss
Igneous or Metamorphic
Sandstone
Arenite (primary component SiO2)
sedimentary
Basalt
Basalt
igneous
Snowflake Obsidian
Obsidian with Cristobalite inclusions
igneous
Sandstone
Arenite (SiO2 primarily)
sedimentary
Mica Schist
Mica Schist (primarily Muscovite or Biotite sheet silicates)
metamorphic
Sandstone Pebble
Arenite (SiO2 complex)
sedimentary
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Chrysocolla and Azurite in Matrix
Hydrated copper phyllosilicate (Chrysocolla - Cu2H2Si2O5(OH)4) and Copper carbonate (Azurite - Cu3(CO3)2(OH)2)
mineral
Sandstone Concretion (Omar or Nut Rock)
Sedimentary Concretion (specifically an 'Omarolluk' or Omar)
sedimentary
Banded Gneiss
Gneiss (Metamorphic Rock)
metamorphic
River Stone / Pebble
Clastic Sediment (composed largely of Quartz, Feldspar, and various rock fragments)
Mineral, Sediment
Massive Quartz with Host Rock
Silicon Dioxide (SiO2)
mineral
Claystone Concretion
Septarian Concretion (Ironstone-rich)
sedimentary