Jasper or Chert
Silicon Dioxide (SiO2)
sedimentary
Category
Sedimentary Rock (Possibly Composed Of Various Minerals)
Browse sedimentary rock (possibly composed of various minerals) specimens identified by the Rock Identifier community.
Chert (Jasper/Chalcedony)
Microcrystalline Silica (SiO2)
sedimentary
Gneiss
Foliated Metamorphic Rock (Gneiss)
metamorphic
Sandstone (River Cobble)
Clastic sedimentary rock (primarily SiO2 with various lithic fragments)
sedimentary
Jasper with Epidote (Unakite-related)
Epidotized Quartzite (composed of Quartz, Epidote, and Feldspar)
metamorphic
Serpentinite
Serpentinite (composed primarily of Serpentine minerals: Mg3Si2O5(OH)4)
metamorphic
Breccia
Breccia (Clastic Sedimentary Rock)
sedimentary
Red Jasper
Jasper (Silicon Dioxide, SiO2)
sedimentary
Quartzite
Quartzite
Metamorphic rock
Apatite
Apatite Group (e.g., Fluorapatite Ca5(PO4)3F, Chlorapatite Ca5(PO4)3Cl, Hydroxylapatite Ca5(PO4)3(OH))
mineral
Limonite (Iron Ore)
Hydrous ferric oxides (FeO(OH)·nH2O)
mineral
Basalt
Mafic volcanic rock, primarily composed of Plagioclase, Pyroxene, and Olivine
Igneous
Amygdaloidal Basalt
Vesicular Basalt with secondary mineral infilling (commonly Zeolites, Calcite, or Quartz)
igneous
Chert (with Iron Staining)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Orange Calcite (Carved as a Horned Skull)
Calcium Carbonate (CaCO3)
mineral
Ironstone Nodules / Siderite Concretion
Siderite (FeCO3) / Ferruginous Septarian Concretion
sedimentary
Diorite
Phaneritic intermediate plutonic rock
Igneous
Gneiss
Gneiss
metamorphic
Coquina / Shelly Limestone
Bioclastic Limestone (composed of CaCO3)
sedimentary
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Basalt
Mafic Volcanic Rock (composed of Plagioclase Feldspar and Pyroxene)
igneous
Slate
Foliated Metamorphic Rock (composed primarily of silica and alumina with iron and magnesium)
metamorphic
Granite
Phaneritic Acidic Igneous Rock (composed of Quartz, Alkali Feldspar, and Plagioclase)
igneous
Sandstone-based Concrete Fragment
Cementitious Composite with Sedimentary Aggregate
sedimentary (man-made/anthropogenic)
Devil's Toenail
Gryphaea (extinct genus of foam oysters, typically composed of Calcite CaCO3)
sedimentary
Septarian Nodule Segment (Turtle Stone)
Septarian Concretion (CaCO3 with Siderite or Calcite infill)
sedimentary
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Honey Calcite
Calcium Carbonate (CaCO3)
mineral
Oolitic Chert
Silicon Dioxide (SiO2) with oolitic texture
sedimentary
Banded Gneiss
Gneiss (high-grade metamorphic silicate rock)
metamorphic
Calcite
Calcite (Calcium Carbonate, CaCO3)
mineral
Botryoidal Chalcedony with Calcite
Chalcedony (SiO2 with accessory minerals, likely CaCO3)
Mineral
Milky Quartz with Mineral Inclusions
Silicon Dioxide (SiO2)
mineral
Lapis Lazuli
Complex rock primarily containing Lazurite (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2
metamorphic
Conglomerate
Conglomerate (Rock composed predominantly of rounded clasts > 2mm)
sedimentary
Dalmatian Stone
Dalmatian Stone (a peralkaline igneous rock consisting of Feldspar, Quartz, and Arfvedsonite)
igneous
Pink Dyed Agate
Silicon Dioxide (SiO2) with synthetic pigment
mineral
Mica Schist with Garnet
Garnetiferous Mica Schist
metamorphic
Conglomerate
Conglomerate (SiO2, Al2O3, Fe2O3, CaCo3)
sedimentary
Limonite (also known as Yellow Ochre or Brown Hematite)
Limonite (Hydrated iron oxide-hydroxide, FeO(OH)·nH2O)
Mineral
Druzy Quartz on Milky Quartz
Silicon Dioxide (SiO2)
mineral
Banded Sandstone (Zebra Stone)
Arenite with Iron Oxide Banding (Liesegang rings)
sedimentary