Jasper
Silicon dioxide (SiO2)
sedimentary
Category
Mineral Like Byproduct (Often Mistaken For Igneous Rock Or Meteorite)
Browse mineral like byproduct (often mistaken for igneous rock or meteorite) specimens identified by the Rock Identifier community.
Basalt
Basalt (Aphanitic Mafic Volcanic Rock)
Igneous
Quartz
SiO₂ (Silicon Dioxide)
Mineral
Granite
Phaneritic plutonic rock (primarily Quartz, Feldspar, and Mica)
igneous
Quartz Geode (partially opened)
Silicon Dioxide (SiO2) with iron staining
mineral
Quartz
Silicon dioxide (SiO2)
mineral
Scoria
Extrusive Igneous Rock (Basaltic/Andesitic Composition)
igneous
Obsidian
Volcanic Glass (Amorphous Silica)
igneous
Basalt
Basalt (principally Plagioclase Feldspar and Pyroxene)
igneous
Pink Granite
Phaneritic plutonic rock (dominated by Alkali Feldspar)
igneous
Peridot (Gem-quality Olivine)
Magnesium Iron Silicate ((Mg, Fe)2SiO4)
mineral
Granite (with Almandine Garnet inclusions)
Granite composed primarily of Quartz (SiO2), K-Feldspar (KAlSi3O8), and Almandine Garnet (Fe3Al2(SiO4)3)
igneous
Diamond
Diamond (pure carbon, C)
mineral
Pyrope Garnet
Magnesium aluminum silicate (Mg3Al2Si3O12)
mineral
Diorite
Diorite (intermediate intrusive igneous rock)
igneous
Agate (Moss or Dendritic Agate)
Chalcedony (Silicon Dioxide, SiO2)
mineral
Concretion (Sandstone)
Sandstone Concretion
sedimentary
Gneiss
Gneiss (High-grade regional metamorphic rock)
metamorphic
Rock Crystal Quartz
Quartz (SiO₂)
Mineral
Pyrite (or Fool's Gold)
Pyrite (FeS₂)
Mineral
Muscovite Mica
Muscovite (KAl2(AlSi3O10)(OH)2)
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Amygdaloidal Basalt
Amygdaloidal Basalt (Mafic volcanic rock with secondary mineral fillings)
igneous
Sandstone
Arenite
sedimentary
Banded Agate (specifically Carnelian Agate)
Silicon dioxide (SiO2) - Chalcedony variety
mineral
Pebble (likely a type of sandstone or quartzite pebble)
Clastic Sediment (specifically, a rudite-sized clast). If the pebble is composed of a specific rock type, its scientific name would be that rock type (e.g., 'Quartzite pebble', 'Granite pebble', 'Chert pebble'). Given its appearance, it is likely a metamorphic quartzite pebble or a hard sandstone pebble.
Sedimentary rock
Veined Quartz
SiO2 (Silicon Dioxide)
Mineral
Granite
Phaneritic Plutonic Igneous Rock (primarily composed of quartz, alkali feldspar, and plagioclase)
igneous
Druzy Quartz on Chalcedony Matrix
Silicon Dioxide (SiO2)
mineral
Diorite (Salt and Pepper Rock)
Phaneritic Plutonic Diorite; chemical composition roughly 52-63% silica (SiO2)
igneous
Obsidian
Volcanic Glass (SiO2)
igneous
Granite Pebble
Granite (a plutonic igneous rock composed primarily of quartz, feldspar, and mica/amphibole)
igneous
Granite Gneiss
Felsic Gneiss
metamorphic
Quartz Vein in Sedimentary Matrix
Silicon Dioxide (SiO2) with host rock
mineral
Diorite
Intermediate plutonic igneous rock
igneous
Peridotite
Peridotite (Ultramafic Rock)
igneous
Granite Gneiss
High-grade regional metamorphic rock (Quartz-Feldspar Gneiss)
metamorphic
Snowflake Obsidian
Volcanic glass with Cristobalite inclusions (70–75% SiO2)
Igneous
Scoria (Vesicular Basalt)
Scoria (Extrusive Mafic Igneous Rock)
igneous
Fluorite (Green Fluorite)
Calcium Fluoride (CaF2)
mineral
Scoria (Lava Rock)
Vesicular Basalt / Scoria
igneous
Banded Gneiss (River Rock/Pebble)
Gneiss (specifically a banded variety, likely a orthogneiss or paragneiss depending on parent rock)
Metamorphic Rock