Basalt with Limonite stains
Extrusive mafic igneous rock; Limonite (FeO(OH)·nH2O)
igneous
Category
Sedimentary Or Metamorphic (Base Substrate)
Browse sedimentary or metamorphic (base substrate) specimens identified by the Rock Identifier community.
Vesicular Basalt
Vesicular Basalt (rich in silicate minerals mostly Plagioclase and Pyroxene)
igneous
Pink Granite
Phaneritic Felsic Igneous Rock (composed primarily of K-feldspar, Quartz, and Biotite)
igneous
Basalt
Extrusive mafic igneous rock
igneous
Basalt
Extrusive Mafic Igneous Rock
igneous
Basalt with Scoria
Mafic Volcanic Rock (Basalt/Scoria)
igneous
Granite
Granite
igneous
Basalt
Basalt (composition of plagioclase feldspar, pyroxene, and olivine)
igneous
Granite
Phaneritic Felsic Igneous Rock (primarily Quartz, Alkali Feldspar, and Plagioclase)
igneous
Granitic Gravel Piece
Granite (Felsic Plutonic Rock / SiO2 with Al2O3, K2O, Na2O)
igneous
Wishing Stone (Basalt with Quartz Vein)
Basalt containing a microcrystalline quartz (SiO2) or calcite vein
igneous
Diorite (River Cobble)
Intrusive Igneous Diorite
igneous
Basalt
Basalt (Mafic volcanic rock)
igneous
Vesicular Basalt (Iron-rich)
Scoriaceous Basalt / Oxidized Vesicular Basalt
igneous
Granite (Pink/Potassium-rich)
Phaneritic Plutonic Felsic Igneous Rock (primarily SiO2 with KAlSi3O8)
igneous
Basalt with Porphyritic Texture
Porphyritic Basalt
igneous
Basalt (Vesicular and Ropey)
Vesicular Basalt / Pahoehoe Basalt
igneous
Basalt (River Pebble)
Extrusive mafic igneous rock
igneous
Basalt (River Pebble)
Basalt
igneous
Pink Granite
Phaneritic Felsic Igneous Rock (Granite)
igneous
Vesicular Basalt (or Scoria)
Basalt (Aphanitic-Vesicular Mafic Igneous Rock)
igneous
Green Aventurine
Silicon Dioxide (Quartz) with Fuchsite inclusions (K(Al,Cr)2(AlSi3O10)(OH)2)
metamorphic
Quartz
Quartz (SiO₂ - Silicon Dioxide)
Mineral
Quartz
Quartz (SiO₂)
mineral
Milky Quartz
Quartz (SiO2)
Mineral
Green Aventurine
Aventurine Quartz (SiO2 with Fuchsite inclusions)
mineral
Blue Quartz (Dumortierite Quartz)
SiO2 with inclusions of AlAl6BSi3O18
mineral
Dumortierite Quartz
Dumortierite (Al7BO3(SiO4)3O3 / inclusion in SiO2)
metamorphic
Emerald in Matrix (Quartz/Schist)
Beryl (Be₃Al₂Si₆O₁₈) with Chromium/Vanadium impurities
mineral
Mixed collection of Quartz varieties, Chalcedony, and metamorphic pebbles
Mixed gemstones (primarily Silicon Dioxide - SiO2)
mineral
Coal (most likely Bituminous or Anthracite)
Bituminous Coal (Grade of Coal), Anthracite (Grade of Coal)
Sedimentary Rock
Tree Agate (Dendritic Agate/Quartz)
Silicon Dioxide (SiO2) with trace Manganese or Iron oxide inclusions
mineral
Dendritic Opal
Hydrated Silica (SiO2·nH2O) with Manganese or Iron Oxide inclusions
mineral
Aura Quartz (Pink/Rose Aura Quartz)
Silicon Dioxide (SiO2) bonded with Platinum and/or Silver
mineral
Bumblebee Jasper
Hydrothermal Volcanic Rock (Primarily Calcite with Orpiment - As2S3, Realgar, and Pyrite)
igneous
Moss Agate
Silicon Dioxide (SiO2) with inclusions of manganese or iron oxides
mineral
Pyrite
Pyrite (Iron sulfide, FeS₂)
mineral
Lapis Lazuli (blue bead) and Moss Agate (green heart)
Lapis Lazuli (lazurite-based rock) and Moss Agate (SiO2 with manganese/iron inclusions)
metamorphic (Lapis) and sedimentary/igneous assoc. (Moss Agate)
Apatite
Apatite Group (e.g., Fluorapatite Ca5(PO4)3F, Chlorapatite Ca5(PO4)3Cl, Hydroxylapatite Ca5(PO4)3(OH))
mineral
Rock Crystal Quartz
Quartz (SiO₂)
Mineral
Granite Glacial Erratic
Intrusive Phaneritic Felsic Rock (Granite)
igneous
Red Jasper
Jasper (Silicon Dioxide with Iron inclusions - SiO2)
Sedimentary/Metamorphic