Granite with Tourmaline or Biotite
Phaneritic Igneous Rock (Granoid)
igneous
Category
Non Geological
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Copper Ore with Chalcocite
Copper sulfide (Cu2S) with associated copper-bearing minerals
mineral
Concretion
Calcareous or ferruginous concretion
sedimentary
Emerald in Matrix
Beryl (Be3Al2Si6O18) with Chromium/Vanadium impurities
gemstone
Moqui Marble (Iron Concretion)
Hematite-Goethite Concretion
sedimentary
Biotite Schist
Schist (Biotite-dominated)
metamorphic
Pyritic Gneiss (with Garnet)
Gneiss containing Pyrite (FeS2) and Almandine Garnet (Fe3Al2(SiO4)3)
metamorphic
Petrified Wood
Silicified Wood (SiO2 permineralization)
fossil
Chalcopyrite (or Pyrite Ore)
CuFeS2 (Copper Iron Sulfide)
mineral
Desert Rose (Gypsum Rose / Barite Rose)
Calcium Sulfate Dihydrate (CaSO4·2H2O) or Barium Sulfate (BaSO4) with Sand inclusions
mineral
Coral Fossil (Petoskey-style or Colonial)
Hexagonaria percarinata (Order: Rugosa)
fossil
Ironstone Concretion (Boxwork)
Siderite-Limonite Concretion (FeO(OH)·nH2O)
sedimentary
Septarian Nodule (Pebble)
Septarian concretion (composition: CaCO3, calcite, aragonite, and clay/mudstone)
sedimentary
Chert Nodule in Limestone
Microcrystalline Silica (SiO2) within Calcium Carbonate (CaCO3)
sedimentary
Quartz Vein in Metamorphic Rock
Quartzite or Schist host with Quartz (SiO2) intrusion
metamorphic
Petrified Wood
Silicified wood (primarily Silicon Dioxide, SiO2)
metamorphic
Red Garnet
Pyrope or Almandine (X3Y2(SiO4)3)
mineral
Petrified Wood
Silicified Wood (primarily SiO2)
fossil
Quartz Geode
Crystalline Silica (SiO2)
mineral
Siltstone
Siltstone (fine-grained clastic sedimentary rock)
sedimentary
Wishing Stone (Basalt or Siltstone with Quartz/Calcite Vein)
Basalt (SiO2+MgO+FeO) or Siltstone with a Quartz (SiO2) or Calcite (CaCO3) vein
igneous or sedimentary
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Geode (Unopened)
Chalcedony Geode (Hydrated Silicon Dioxide, SiO2)
sedimentary
Garnet (Almandine/Pyrope series)
Garnet Group - X3Y2(SiO4)3
mineral
Crinoid Stalk in Limestone
Crinoid fossil in Biomicrite (Limestone)
sedimentary
Limonite Concretion
Goethite/Limonite (FeO(OH)·nH2O)
sedimentary
Fossiliferous Limestone with Rugose Coral
Calcite (CaCO3) containing a Rugosa (Horn Coral) fossil
sedimentary
Quartz Geode
Silicon Dioxide (SiO2) in Host Rock
sedimentary
Petrified Wood
Silicified Wood / Chalcedony (SiO2)
mineral
Crinoid and Coral Fossils in Limestone
Fossiliferous Limestone with Rugosa (order) and Crinoidea (class)
sedimentary
Banded Agate (Agatized Geode Slice)
Silicon Dioxide (SiO₂)
mineral
Jasper Conglomerate
Jasperoid Conglomerate (predominantly SiO2 with iron oxide impurities)
sedimentary
Chert Nodule in Limestone
Silicon Dioxide (SiO2) in Calcium Carbonate (CaCO3)
sedimentary
Petrified Wood
Silicified Wood (primarily SiO2 - Silicon Dioxide)
sedimentary
Serpentinite (with Pyrite/Garnet inclusions)
Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)3Si2O5(OH)4
metamorphic
Glaucophane Schist (Blueschist)
Glaucophane Schist
metamorphic
Moqui Marbles
Iron Oxide Concretion (Hematite/Goethite)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Petrified Coral (Agatized Coral)
Anthozoa (Agatized Fossil)
sedimentary
Chalcedony Geode Fragment (Botryoidal)
Silicon Dioxide (SiO2) - Cryptocrystalline Quartz
mineral
Fossilized Horn Coral
Rugosa
fossil
Petrified Wood
Silicified Wood (primarily Chalcedony or Quartz, SiO2)
sedimentary