Granite Pebble (Salt and Pepper Granite)
Felsic Intrusive Igneous Rock (Granite)
igneous
Category
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Basalt with Iron Oxides
Mafic Igneous Rock (Mafite)
igneous
Quartzite
Quartzite (SiO2)
metamorphic
Quartz (River Pebble)
Silicon Dioxide (SiO2)
mineral
Granite
Felsic Plutonic Rock (primarily SiO2, Al2O3, K2O, Na2O)
igneous
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Jasper
Silicon Dioxide (SiO2) with impurities
mineral
Yellow Quartz (Chalcedony)
Quartz / Chalcedony (Silicon Dioxide, SiO2)
mineral
Sandstone Concretion
Moqui Marble / Iron-oxide Concretion (SiO2 with Hematite/Goethite)
sedimentary
Amygdaloidal Basalt
Basalt with secondary mineral infilling (commonly Zeolite, Calcite, or Quartz)
igneous
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Basaltic Tuff / Volcanic Breccia
Pyroclastic Breccia / Lithic Tuff
igneous
Druzy Quartz Geode (likely Smokey Quartz variety)
Silicon Dioxide (SiO2) - specifically a geode formation lined with druzy quartz crystals, with a likely brownish hue indicating smokey quartz.
Mineral structure/Rock
Sandstone (Quartzose)
Arenite (SiO2 based)
sedimentary
Emerald In Matrix
Beryl (Be3Al2Si6O18) with trace Chromium/Vanadium
mineral
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Slag
Metallurgical by-product
Anthropogenic (Man-made material)
Lapis Lazuli
Complex mixture of minerals (lazurite, calcite, pyrite, and sodalite); (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2
metamorphic
Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
mineral
Chert (Septarian Concretion/Nodule)
Microcrystalline silica (SiO2) with carbonate mineral veining
sedimentary
Sandstone (with potentially metamorphic or basaltic bands)
Arenite / Lithic Wacke
sedimentary
Shale or Mudstone (Based on appearance)
Shale (fine-grained, laminated fissile sedimentary rock) / Mudstone (fine-grained, non-fissile sedimentary rock)
Sedimentary
Schist
Mica Schist
metamorphic
Tiger's Eye
Pseudomorph of Crocidolite (SiO2 with iron oxides)
mineral
Sandstone (with Iron Staining)
Clastic Sedimentary Rock (primarily SiO2)
sedimentary
Granite
Phaneritic Felsic Igneous Rock
igneous
Limestone (specifically Travertine or Tufa)
Calcium Carbonate (CaCO3)
sedimentary
Serpentinite (Serpentine Rock)
Primarily composed of serpentine group minerals, such as antigorite, chrysotile, and lizardite. Chemical formula for serpentine minerals is (Mg,Fe)3Si2O5(OH)4.
Metamorphic
Granatic Pegmatite
Pegmatitic Granite
igneous
Diorite
Diorite (Intermediate Plutonic Rock)
igneous
Druzy Quartz
Silicon Dioxide (SiO2)
mineral
Olivine (Peridotite)
(Mg,Fe)2SiO4 (Magnesium Iron Silicate)
igneous
Sandstone (Quartzose Sandstone)
Arenite (SiO2)
sedimentary
Quartz / River Cobble
Silicon Dioxide (SiO2)
mineral
Quartz (Iron-stained)
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Druzy Quartz on Host Rock
Silicon Dioxide (SiO2)
mineral
Septarian Nodule (Septarian Dragon Stone)
Septarian Concretion (CaCO3 + Al2Si2O5(OH)4)
sedimentary
Quartzite
Quartzite (Primary mineral: Silicon Dioxide, SiO₂)
metamorphic
Pink Granite
Felsic intrusive igneous rock
igneous
Diorite
Diorite (an intrusive igneous rock)
igneous
Milky Quartz (Druzy Geode fragment)
Silicon Dioxide (SiO2)
mineral