White Marble
Recrystallized Calcite (CaCO3)
Category
Browse sedimentary (chemically precipitated mineral) specimens identified by the Rock Identifier community.
White Marble
Recrystallized Calcite (CaCO3)
Vanadinite
Vanadinite (Pb5(VO4)3Cl)
Chert Pebble
Microcrystalline or Cryptocrystalline Quartz (SiO2)
Chert Nodule (Commonly known as a Flint or River Cobble)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
Chert (variously identified as Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
Limestone
Sedimentary rock composed of Calcium Carbonate (CaCO3)
Limestone
Calcium Carbonate (CaCO3)
Limestone (Micrite/Chalky variety)
Calcium Carbonate (CaCO3)
Banded Jasper (Chert)
Silicon Dioxide (SiO2) - variety of Chalcedony
Caliche (also known as hardpan, calcrete, kankar)
Primarily composed of calcium carbonate (CaCO₃), often mixed with other minerals like quartz, clay minerals, and iron oxides.
Sandstone (Ferruginous)
Arenite with Iron-oxide inclusions (SiO2 primarily)
Magnetite (Lodestone)
Magnetite (Fe3O4)
Glauconitic Sandstone
Glauconitic Sandstone (contains (K,Na)(Fe,Al,Mg)2(Si,Al)4O10(OH)2)
Turquoise
Turquoise (CuAl6(PO4)4(OH)8·4H2O)
Blue Apatite
Apatite (Calcium Phosphate) - Ca5(PO4)3(F,Cl,OH)
Quartz (River Pebble)
Silicon Dioxide (SiO2)
Fluorite (Green Fluorite)
Fluorite (Calcium Fluoride, CaF2)
Chert Geode or Nodule
Microcrystalline Quartz (SiO2)
Limonite Concretion
Hydrated iron(III) oxide-hydroxide (FeO(OH)·nH2O)
Quartz Druze on Matrix
Silicon Dioxide (SiO2)
Limestone
Sedimentary Calcium Carbonate (CaCO3)
Siltstone/Sandstone (possibly Wonderstone or Picture Sandstone)
Clastic Sedimentary Rock (primarily SiO2 with Iron Oxide inclusions)
Concretion
Various mineral compositions, typically carbonate or iron oxide cemented sediment
Chert (Jasper/Flint variety)
Silicon Dioxide (SiO2)
Quartz (likely a form of massive or vein quartz)
Quartz (SiO₂)
Milky Quartz (Water-Worn Cobble)
Silicon Dioxide (SiO2)
Yellow Calcite
Calcite (Calcium Carbonate, CaCO3)
Yellow Calcite
Calcium Carbonate (CaCO3)
Quartz (Milky/Chalcedony variety)
Silicon Dioxide (SiO2)
Jasper (Cream/Yellow variety)
Jasper (Microcrystalline Quartz, SiO2)
Yellow Chert or Jasper
Silicon Dioxide (SiO2)
Quartz Pebble
Quartz (Silicon Dioxide - SiO2)
Chert (Mudstone)
Microcrystalline Quartz (SiO2)
Chert (Flint)
Microcrystalline Quartz (SiO2)
Chert (Nodular Chert)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
Red Jasper
Jasper (Silicate Mineral - SiO2)
Gold Nugget
Native Gold (Au)
Gold
Native Gold (Au)
Gold and Cubic Zirconia (San Judas Tadeo Pendant)
Native Gold (Au) with Synthetic Cubic Zirconia (ZrO2)
Gold
Native Gold (Au)
Quartz (Chert/Chalcedony Variety)
Silicon Dioxide (SiO2)
Blue Chalcedony
Silicon Dioxide (SiO2) - Cryptocrystalline Quartz