Granite Water-Worn Pebble
Phaneritic intrusive igneous rock (Felsic)
igneous
Category
Mineral Based Alloy (Anthropogenic)
Browse mineral based alloy (anthropogenic) specimens identified by the Rock Identifier community.
Learn about Mineral Based Alloy (Anthropogenic) in the encyclopedia
View all →
River Stone (Basalt)
Basalt (Aphanitic Mafic Igneous Rock)
igneous
Limestone
Calcium Carbonate (CaCO3)
sedimentary
River-worn Basalt
Basalt (Mafic Extrusive Igneous Rock)
igneous
Porphyritic Basalt
Amygdaloidal Porphyritic Basalt
igneous
Granite
Phaneritic Felsic Igneous Rock (composed primarily of Quartz and Alkali Feldspar)
igneous
Basalt Pebble
Basalt
igneous
Pink Granite
Phaneritic Felsic Intrusive Igneous Rock
igneous
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Basalt
Basalt (Volcanic Mafic Rock)
igneous
Coquina
Coquina (Bioclastic Limestone)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Granite
Phaneritic Felsic Igneous Rock (Granite)
igneous
Basalt
Basalt (SiO2 percentage between 45% and 52%)
igneous
Basalt
Basalt (primarily Plagioclase feldspar and Pyroxene)
igneous
Basalt Pebble
Vesicular Basalt
igneous
Chert (Commonly known as Flint)
Silicon Dioxide (SiO2)
sedimentary
Red Quartzite (Ferruginous Quartz)
Quartzite (SiO2 with Fe2O3 inclusions)
metamorphic
Chert (River Pebble)
Microcrystalline Quartz (SiO2)
sedimentary
Diabase (Greenstone)
Diabase or Dolerite
igneous
Granite Pebble
Granite (composed primarily of Quartz SiO2, Feldspar KAlSi3O8, and Mica)
igneous
Granite
Phaneritic intrusive igneous rock (composed mainly of Quartz SiO2, Feldspar KAlSi3O8, and Biotite/Mica)
igneous
Porphyritic Basalt
Porphyritic Basalt (with plagioclase phenocrysts)
igneous
Chert (River Pebble)
Microcrystalline Quartz (SiO2)
sedimentary
Mica Schist
Mica Schist (primarily Muscovite or Biotite KAl2(AlSi3O10)(OH)2)
metamorphic
Mica Schist
Foliated Metamorphic Rock (Schist)
metamorphic
Picasso Jasper (or Picasso Marble)
Metamorphosed Limestone (Calcium Carbonate, CaCO3, with impurities)
metamorphic
Glauconitic Sandstone
Glauconitic arenite (K,Na)(Fe3+,Al,Mg)2(Si,Al)4O10(OH)2
sedimentary
Coquina / Fossiliferous Limestone
Calcareous bioclastic sedimentary rock (CaCO3)
sedimentary
Porphyritic Basalt (likely Chinese Writing Stone)
Porphyritic Basalt / Plagioclase Feldspar in Basal Matrix
igneous
Jasper (specifically Bloodstone or Heliotrope variety)
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary (chemically precipitated)
Moss Agate
Moss Agate (a variety of Chalcedony, SiO ₂)
Mineral (specifically a variety of Chalcedony, which is microcrystalline Quartz)
Fossiliferous Limestone (Coquina)
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Limestone with Lichen
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Mica Schist
Mica Schist
metamorphic
Bloodstone Jasper (Heliotrope)
SiO2 (Silicon Dioxide) - Cryptocrystalline Quartz
sedimentary
Graphic Granite
Pegmatitic Feldspar and Quartz (Graphic Granite)
igneous
Marble (Fire and Ice or Pink Veined)
Metamorphosed Limestone (principally CaCO3)
metamorphic
![Mica Schist (Mica Schist (primarily Muscovite [KAl2(AlSi3O10)(OH)2] or Biotite)) — metamorphic](https://media.rockidentification.com/cde02de2-2d7b-4875-a7ad-bd7d41ea40c0-thumbnail.jpg)
Mica Schist
Mica Schist (primarily Muscovite [KAl2(AlSi3O10)(OH)2] or Biotite)
metamorphic
Coquina
Biogenic Limestone (Coquina)
sedimentary
Green Moss Agate
Silicon Dioxide with inclusions (SiO2)
sedimentary