Quartz-veined Diabase or Basalt Pebble
Diabase or Basalt with Hydrothermal Quartz Veins (SiO2)
igneous
Category
Synthetic (Not A Rock Or Mineral)
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Quartz Vein in Host Rock
Silicon Dioxide (SiO2)
mineral with metamorphic or sedimentary host
Quartz Geode Fragment
Silicon Dioxide (SiO2)
mineral
Quartz Geode (partially formed)
Silicon Dioxide (SiO2)
mineral
Chert on Volcanic Host Rock
Sedimentary Chert (SiO2) within Basalt or Andesite
sedimentary
Sandstone or Quartzite
Arenite (if sedimentary) / Quartzite (if metamorphic)
Sedimentary or Metamorphic
Porphyritic Basalt (Porphyry pebble)
Porphyritic Basalt / Amygdaloidal Basalt
igneous
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Hag Stone
Perforated sedimentary rock (typically limestone, sandstone, or flint)
sedimentary
Granite with Mafic Inclusions
Granite (Phaneritic igneous rock composed of Quartz, Feldspar, and Mica)
igneous
Granite
Phaneritic Intrusive Igneous Rock (composed of Quartz, Feldspar, and Mica)
igneous
Mica Schist
Mica Schist (predominantly Muscovite or Biotite sheet silicates)
metamorphic
Granite
Granite
Igneous
K2 Azurite Granite / K2 Stone
Granite (igneous rock) with Azurite inclusions (mineral)
igneous
Muscovite Mica
Muscovite KAl2(AlSi3O10)(OH)2
mineral
Biotite Mica
Biotite (K(Mg,Fe)3AlSi3O10(OH,F)2)
mineral
Schist
Schist (Crystalline metamorphic rock)
metamorphic
Granite Boulder
Intrusive Igneous Rock
igneous
Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Greenstone / Epidosite
Epidosite (primary minerals: Epidote and Quartz)
metamorphic
Iron-stained Quartz Vein
Silicon Dioxide (SiO2) with Limonite/Hematite inclusions
mineral
Sandstone (Quartzose)
Arenite (composed primarily of SiO2)
sedimentary
Fossil Shell (Bivalve)
Class Bivalvia (fossilized)
fossil
Quartz (Milky Quartz / Quartzite)
Silicon Dioxide (SiO2)
mineral
Lapis Lazuli
Lapis Lazuli (a rock type, not a single mineral, composed primarily of lazurite, calcite, and pyrite)
Mineral, part of a rock
Sandstone
Arenite (primarily Quartz and Feldspar composition)
sedimentary
Sandstone
Arenite (primarily Quartz-based)
sedimentary
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Ferruginous Sandstone (Ironstone)
Clastic Sedimentary Rock (composed of SiO2 with Fe2O3/FeO(OH) cement)
sedimentary
Granite
Intrusive Igneous Rock (Mainly Quartz, Feldspar, and Mica)
igneous
River Pebble
Quartzite / Weathered Sedimentary Rock
sedimentary
Milky Quartz
Quartz (Silicon Dioxide - SiO2)
mineral
Geode
Quartz nodule / Chalcedony-lined cavity
sedimentary
Basalt with Amygdules
Amygdaloidal Basalt
igneous
Gneiss
Gneiss (foliated metamorphic rock)
metamorphic
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Vesicular Basalt with Lichen
Vesicular Basalt
igneous
Gneiss
Gneiss
metamorphic
Limonite (Ironstone Concretion)
Limonite: FeO(OH)·nH2O
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Pink granite
Granite; predominantly quartz, K-feldspar, plagioclase, and biotite/hornblende
igneous
Milky Quartz
Silicon Dioxide (SiO2)
mineral