Ocellar Rhyolite
Rhyolite (featuring orbicular/ocellar quartz and feldspar textures)
igneous
Category
Sedimentary (Secondary Mineral) Within Igneous
Browse sedimentary (secondary mineral) within igneous specimens identified by the Rock Identifier community.
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Basalt with Quartz Veining
Mafic Volcanic Rock with Silicate Micro-veins
igneous
Basalt with Quartz Veins
Basalt (composition: SiO2, MgO, FeO, Al2O3, CaO)
igneous
Limestone with Quartz/Calcite Veins
Sedimentary Limestone (CaCO3 with SiO2 or CaCO3 intrusions)
sedimentary
Labradorite (Small Tumbled or Water-Worn Fragment)
(Ca,Na)(Al,Si)4O8
mineral
Basalt
Mafic volcanic rock, primarily composed of Plagioclase, Pyroxene, and Olivine
Igneous
Red Aventurine (Strawberry Quartz / Sunstone Quartz)
Silicon Dioxide with Hematite/Goethite inclusions (SiO2)
mineral
Brecciated Agate / Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
mineral
Milky Quartz with Talc / Serpentine
Silicon Dioxide (SiO2) with Mg3Si4O10(OH)2
metamorphic
Amethyst
Amethyst (Silicon Dioxide with iron impurities, SiO2)
mineral
Amethyst
Silicon Dioxide (SiO2) with Iron impurities
mineral
Biotite Granite
Phaneritic Felsic Igneous Rock
igneous
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
gemstone
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Snowflake Obsidian
Obsidian with Cristobalite inclusions (SiO2)
igneous
Red Jasper
Silicon Dioxide (SiO2) with Hematite inclusions
sedimentary/mineral
Basalt Porphyry
Porphyritic Basalt
igneous
Nile Agate
Silicon Dioxide (SiO2)
sedimentary
Blue Sapphire
Corundum (Al2O3)
mineral
Magnetite (or Magnetic Iron Ore)
Magnetite (Fe3O4)
mineral
Quartz Geode
Crystalline Silicon Dioxide (SiO2)
mineral
Quartz with Iron Oxide Inclusions
Silicon Dioxide (SiO2)
mineral
Limestone with Calcite
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Strawberry Quartz (Quartz with Hematite inclusions)
Silicon Dioxide with Iron Oxide (SiO2 + Fe2O3)
mineral
Carnelian / Agate
Silicon Dioxide (SiO2) - Chalcedony variety
mineral
Pegmatite
Igneous Pegmatite
igneous
Limonite Concretion
FeO(OH)·nH2O (Hydrated Iron Oxide)
sedimentary
Amazonite
Amazonite (KAlSi3O8)
mineral
Agate (specifically Lace Agate or Banded Agate)
Silicon Dioxide (SiO2)
mineral
Chert (Common Opal/Jasper transition)
Silicon Dioxide (SiO2)
sedimentary
Quartzite (Quartz Pebble)
Quartzite (SiO2 with iron oxide inclusions)
metamorphic
Pink Granite
Granite (Felsic Plutonic Igneous Rock)
igneous
Granite
Granite (composed primarily of Quartz SiO2, Alkali Feldspar KAlSi3O8, and Plagioclase Feldspar)
igneous
Calcite
Calcite (CaCO₃, Calcium Carbonate)
Mineral
Orbicular Rhyolite (Rainforest Jasper)
Rhyolite containing Spherulites (SiO2 with impurities)
igneous
Fossilized Fish Skeleton in Matrix
Vertebrata (Class: Actinopterygii), typically found in limestone or shale matrices
sedimentary
Almandine Garnet
Iron aluminum silicate (Fe3Al2(SiO4)3)
Mineral
Calcite
Calcite (Mineral, Calcium Carbonate - CaCO3)
Mineral
Amazonite
K(AlSi3O8) - Lead-bearing Microcline
mineral
Quartz (Druzy) on Matrix
Silicon Dioxide (SiO2)
mineral
Agate (Grey Agate Slice)
Microcrystalline Quartz (SiO2)
mineral
Rhodochrosite
Manganese carbonate (MnCO3)
mineral