Chert (Jasper/Flint variant)
Silicon Dioxide (SiO2)
sedimentary
Category
Not A Geological Specimen
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Emerald In Matrix
Beryl (Be3Al2Si6O18) with Chromium/Vanadium impurities
mineral
Orange Calcite
Calcite (CaCO3)
Mineral
Quartz (Iron-stained)
Silicon Dioxide (SiO2)
mineral
Quartz (Citrine or Iron-Stained)
Silicon Dioxide (SiO2)
mineral
Ironstone Concretion (Moqui Marble variety)
Ferruginous Sandstone Concretion
sedimentary
Druzy Quartz Geode (Oco or Moroccan variety)
Silicon Dioxide (SiO2)
mineral
Quartz Geode
Silicon Dioxide (SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
mineral
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Gold Ore in Quartz/Matrix
Native Gold (Au) in Quartz (SiO2) matrix
mineral
Geode (Unopened)
Silica-lined Vug (primarily SiO2)
sedimentary
Sandstone with Trace Fossils
Arenite with Ichnofossils
sedimentary
Vesicular Basalt with Xenocrysts
Mafic Igneous Plutonic/Extrusive Complex
igneous
Milky Quartz with Iron Staining
Quartz (Silicon Dioxide) - SiO2
mineral
Pink Granite Pebble
Granite (Phaneritic igneous rock)
igneous
Granite Pebble
Granite (phaneritic igneous rock)
igneous
Hematitic Sandstone
Sandstone with Iron Oxide (Hematite) staining
sedimentary
Sedimentary Sandstone (Sandstone Slab)
Arenite (SiO2 with Fe2O3 staining)
sedimentary
Porphyritic Basalt or Andesite
Porphyritic Basalt/Andesite
Igneous
Granite
Intrusive igneous rock (high SiO2)
igneous
Quartz with Schist Inclusion
Quartz (SiO2) with micaceous schist inclusions
metamorphic
Agate Geode Node
Cryptocrystalline Quartz (SiO2)
mineral
Quartz Geode (Cracked Open)
Quartz (Silicon Dioxide - SiO2)
mineral
Quartz with Inclusions
Silicon Dioxide (SiO2) with various mineral inclusions
mineral
Ocean Jasper (Orbicular Jasper)
Silica (SiO2) with varied mineral inclusions
mineralogical specimen
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Granite
Phaneritic Felsic Igneous Rock
igneous
Moqui Marble (Concretion)
Iron Oxide Concretion
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Basalt
Mafic Igneous Rock (composed primarily of plagioclase, pyroxene, and olivine)
igneous
Sandstone (Ferruginous)
Arenite (Iron-rich)
sedimentary
Chalcedony (Grey/White Agate)
Silicon Dioxide (SiO₂)
mineral
Iron-stained Quartzite
Metamorphic Quartz (SiO2) with limonite/hematite staining
metamorphic
Copper-bearing Quartz (likely Malachite on Quartz matrix)
Cu2CO3(OH)2 (Malachite) on SiO2 (Quartz)
mineral
Banded Agate
Chalcedony / Silicon Dioxide (SiO2)
mineral
Kambaba Jasper (Crocodile Jasper)
Stromatolite (Fossilized Algae)
sedimentary
Fluorite (Polished Point/Tower)
Calcium Fluoride (CaF2)
mineral
Amber (Tumbled/Polished)
Succinite (Fossilized Tree Resin)
mineraloid
Lapis Lazuli
Lazurite-rich metamorphic rock
metamorphic
Amber
Succinite (specifically for Baltic amber; general formula C10H16O)
Mineraloid (Organic)
Bauxite
Hydrated Aluminum Oxides (primarily Gibbsite Al(OH)3, Boehmite γ-AlO(OH), and Diaspore α-AlO(OH))
sedimentary