Mineral, Part Of A Rock

Quartz on Basalt

Silicon Dioxide (SiO2) on Mafic Igneous Rock

Desert Varnish (on Sandstone)

Rock Varnish (composed of Manganese oxides, Iron oxides, and Clay minerals)

Granite

Granite (Felsic Plutonic Rock)

Massive Quartz with Host Rock

Silicon Dioxide (SiO2)

Epidote in Basalt

Epidotized Basalt (Ca2(Al2,Fe)(SiO4)(Si2O7)O(OH) in Mafic Igneous Host)

Prehnite

Prehnite Ca2Al2Si3O10(OH)2

Ironstone Concretion (Nutstone)

Ironstone (with High Limonite/Hematite Content)

Bauxite

Bauxite (Mixture of Al(OH)3, AlO(OH), and Fe2O3)

Diorite

Diorite (an intrusive igneous rock)

Diorite

Intermediate plutonic igneous rock

Basalt with Secondary Mineralization (Likely Zeolites or Calcite)

Aphanitic mafic volcanic rock with secondary mineral inclusions (e.g., CaAl2Si3O10·3H2O for Scolecite)

Pyrite (on Shale/Matrix)

Iron Disulfide (FeS2)

Sandstone (Pebble)

Arenite (composed primarily of SiO2)

Schist

Mica Schist

Granite

Granite (Felsic Plutonic Rock)

Gneiss

Gneiss (Metamorphic rock)

Ferruginous Sandstone

Arenite with Iron-oxide cement (composed of Quartz and Limonite/Hematite)

Chrysocolla in Matrix

Hydrated copper phyllosilicate mineral (Cu,Al)2H2Si2O5(OH)4·nH2O

Gneiss

High-grade metamorphic rock (Gneiss)

Banded Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Smoky Quartz

Smoky Quartz (SiO2: Silicon Dioxide)

Dendritic Agate

Silicon Dioxide (SiO2) with Manganese/Iron oxide inclusions

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Olivine in Basalt (Peridot)

Magnesium Iron Silicate (Mg,Fe)2SiO4 (Mineral) within Basalt (Rock)

Sandstone with Liesegang Rings

Arenite with Iron Oxide Concretions

Sandstone (Weathered Cobble)

Clastic Sedimentary Rock (primarily SiO2)

Sandstone (Ferruginous)

Clastic sedimentary rock (primarily SiO2 with Fe2O3 cement)

Sulfide Ore (likely Galena and Sphalerite in Quartz)

Lead-Zinc Ore (PbS and ZnS)

Foliated Metamorphic Rock (likely Gneiss or Schist)

Gneissic Metamorphic Rock

Basalt with Quartz/Calcite Vein

Basalt (Mafic Volcanic Rock with secondary mineralization)

Granite

Granite (Felsic intrusive igneous rock)

Sandstone (Quartzose)

Sandstone (clastic sedimentary rock, primarily SiO2)

White Quartz

Silicon Dioxide (SiO2)

Granitic Pegmatite

Granite Pegmatite (coarse-grained intrusive igneous rock)

Quartz Geode Fragment

Silicon Dioxide (SiO2)

Basalt

Basalt (dominated by plagioclase feldspar and pyroxene)

Quartz-veined Basalt

Amygdaloidal or Porphyritic Basalt with Silicon Dioxide (SiO2) vein

Granite Gneiss

Gneiss (High-grade regional metamorphic rock)

Sandstone (with Iron Siderite Concretion)

Arenite with Ironstone Concretion (FeCO3)

Banded Gneiss

Gneiss (Metamorphic Rock)

Granite (Pink/Red)

Phaneritic Plutonic Felsic Rock (major minerals: Quartz, Orthoclase Feldspar, Plagioclase Feldspar)