Silver (Native Element)
Ag (Argentum)
mineral
Category
Man Made Metamorphic Style Composite
Browse man made metamorphic style composite specimens identified by the Rock Identifier community.
Rhodonite
Rhodonite (MnSiO3)
Mineral
Granite
Phaneritic Felsic Igneous Rock
igneous
Sandstone (likely Fossiliferous)
Arenite / Sedimentum arenaceum
sedimentary
Chert (Fossiliferous)
Silicon dioxide (SiO2)
sedimentary
Banded Gneiss (River Cobble)
Gneiss (a high-grade metamorphic rock)
metamorphic
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Quartzite
Quartzite (primarily SiO2)
metamorphic
Quartz
Quartz (SiO2)
Mineral
Zebra Jasper
Silicon Dioxide (SiO2) with various inclusions
metamorphic/sedimentary
Granite
Granite (Phaneritic Quartz-Feldspar Rock)
igneous
Limestone
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Sandstone (Ferruginous)
Ferruginous Sandstone (SiO2 with iron oxide cement)
sedimentary
Sandstone
Sandstone (arenite is a more specific geological term for a clean sandstone, while wacke refers to a dirty sandstone with significant matrix)
Sedimentary
Tiger's Eye
Silicon dioxide (SiO2) with fibrous inclusions of crocidolite (riebeckite) that have been altered to limonite and then replaced by quartz
Mineral
Quartz (likely a form of massive or vein quartz)
Quartz (SiO₂)
Mineral
Clay (as a rock-forming material)
Clay minerals (e.g., Kaolinite group, Smectite group, Illite group, Chlorite group)
Mineral
Green Aventurine and Clear Quartz
Aventurine (variety of Quartz - SiO2) and Quartz (SiO2)
Mineral
Dendritic Agate (or Dendritic Opal)
SiO2 (for Agate), SiO2·nH2O (for Opal)
Mineral
Moonstone
Adularia (orthoclase feldspar variety)
mineral
Ruby
Corundum (Al2O3 with Chromium traces)
mineral
Lapis Lazuli
Lapis Lazuli (a rock composed primarily of Lazurite (Na,Ca)8(AlSiO4)6(S,SO4,Cl)1-2, with varying amounts of Calcite, Pyrite, and Sodalite).
Mineral
Granite (weathered)
Felsic Intrusive Igneous Rock (composed of Quartz, Alkali Feldspar, and Plagioclase)
igneous
Rutilated Quartz
Silicon Dioxide (SiO2) with Titanium Dioxide (TiO2) inclusions
mineral
Limonitic Sandstone with Inclusion
Limonitic Quartz Sandstone (primarily SiO2 with FeO(OH)·nH2O)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Zebra Jasper
Silicon Dioxide (SiO2) with iron oxide and manganese inclusions
metamorphic
Granite
Granite (a common name for a felsic intrusive igneous rock)
Igneous Rock
Basalt (Water-worn Pebble)
Basalt (Aphanitic Mafic Igneous Rock)
igneous
Carnelian
Carnelian Chalcedony (SiO2)
mineral
Rough Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Banded Gneiss (with possible weathered sulfide or iron staining)
Gneiss, potentially with iron oxide/hydroxide staining (e.g., limonite) or weathered sulfides
Metamorphic
Greenstone (possibly Basalt or Greenschist)
Greenschist (composed primarily of chlorite, actinolite, and epidote)
Metamorphic (low-grade)
Sandstone
Arenicola (comprising mostly Quartz, SiO2)
sedimentary
Quartz (in a rock matrix)
Quartz (SiO2)
mineral
Granite
Granite (Mainly Quartz SiO2, K-Feldspar KAlSi3O8, and Plagioclase)
igneous
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Sandstone (River Cobble)
Clastic sedimentary rock (primarily SiO2 with various lithic fragments)
sedimentary
Granite
Granite (a broadly defined plutonic igneous rock, often more specifically classified as quartz monzonite or granodiorite based on precise mineral percentages)
igneous
Feldspar (specifically Orthoclase)
Potassium Aluminum Silicate (KAlSi3O8)
mineral
Jade (Nephrite or Jadeite)
Nephrite (Ca2(Mg,Fe)5Si8O22(OH)2) or Jadeite (Na(Al,Fe3+)Si2O6)
Metamorphic Rock / Mineral