![Charoite with Aegirine inclusions ((K,Sr)15-16(Ca,Na)32[Si6O11(O,OH)6]2[Si12O18(O,OH)12]2[Si17O25(O,OH)18]2(OH,F)4.0-3.0 * nH2O + NaFeSi2O6) — mineral](https://media.rock.id/charoite-with-aegirine-inclusions-fc599b15-b4a9-4cef-a11f-71ff16191db4-thumbnail.jpg)
Charoite with Aegirine inclusions
(K,Sr)15-16(Ca,Na)32[Si6O11(O,OH)6]2[Si12O18(O,OH)12]2[Si17O25(O,OH)18]2(OH,F)4.0-3.0 * nH2O + NaFeSi2O6
mineral
Category
Limestone
Browse limestone specimens identified by the Rock Identifier community.
Travertine
Calcium Carbonate (CaCO3)
sedimentary
Yellow Calcite
Calcium Carbonate (CaCO3)
mineral
Bauxite
Alumina ore (Mixture of Gibbsite, Boehmite, and Diaspore)
sedimentary
![Lapis Lazuli (polished cabochon) (Lazurite-rich rock (Na8[Al6Si6O24]n(S,Cl,SO4,OH)2)) — metamorphic](https://media.rockidentification.com/27578b1c-70e8-46cf-91c4-a0f8d04477f9-thumbnail.jpg)
Lapis Lazuli (polished cabochon)
Lazurite-rich rock (Na8[Al6Si6O24]n(S,Cl,SO4,OH)2)
metamorphic
Blue Celestite (Celestine)
Strontium sulfate (SrSO4)
mineral
Note: Image shows a biological specimen (Rat), not a rock. Representative geological equivalent: Galena (due to lead-grey colors in fur).
Galena (PbS)
mineral
Chert (or potentially massive Quartz/Quartzite)
SiO2 (Silicon Dioxide)
sedimentary (if chert) / metamorphic (if quartzite)
Lapis Lazuli (Fragment)
Lazurite-rich metamorphic rock
metamorphic
Chert (Flint)
Chert (SiO2)
sedimentary
Brain Coral Fossil
Family Mussidae or Merulinidae (Order Scleractinia)
sedimentary
Limestone with Calcite Crystals
Sedimentary Rock containing Calcium Carbonate (CaCO3)
sedimentary
Banded Chert
Silicon Dioxide (SiO2)
sedimentary
Chert Concretion with Iron Oxide Staining
Microcrystalline Quartz (SiO2)
sedimentary
Chert (often called Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Sandstone or Limestone
Arenite or Calcareous Sedimentary Rock
Sedimentary
Fossilized Oyster Shell
Exogyra or Ostrea (Gryphaeidae/Ostreidae family)
fossil
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Fossilized Echinoid (Sea Urchin)
Echinoidea (Class)
sedimentary
Botryoidal Agate / Chalcedony Geode
Silicon Dioxide (SiO2)
mineral
Quartz Geode
Crystalline Silicon Dioxide (SiO2)
mineral
Bivalve Fossil (Internal Mold/Steinkern)
Class Bivalvia (Fossilized Mold)
sedimentary
Chert (Flint Nodules)
Silicon Dioxide (SiO2)
sedimentary
Fossiliferous Limestone with Brachiopod
Phylum Brachiopoda in Sedimentary Matrix (CaCO3)
fossil
Chert (with Limestone matrix)
Silicon dioxide (SiO2)
sedimentary
Fossiliferous Limestone
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Fossiliferous Limestone
Biogenic Limestone with Brachiopod/Crinoid fragments
sedimentary
Septarian Nodule (Dragon Stone)
Septarian concretion (Complex of Calcite, Aragonite, and Limestone)
sedimentary
Septarian Nodule (Dragon Stone) sphere
Septarian concretion (Calcite, Aragonite, and Limestone)
sedimentary
Fossilized Coral (Petoskey Stone / Chain Coral)
Scleractinia (Order) / Halysites (Genus for Chain Coral types)
sedimentary
Travertine
Terrestrial Sedimentary Limestone (CaCO3)
sedimentary
Cream Marble (Speckled)
Metamorphosed Limestone (mainly CaCO3)
metamorphic
Chert (Flint nodule)
Silicon Dioxide (SiO2)
sedimentary
Chert (Jasper)
Silicon Dioxide (SiO2)
sedimentary
Chert (Nodule)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Chert
Chert (SiO2)
sedimentary
Chert (with nodule)
Microcrystalline Quartz (SiO2)
sedimentary
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Nodule)
Chert (Silicon dioxide, SiO2)
sedimentary
Chert (Basanite)
Chert (Microcrystalline SiO2)
sedimentary
Chert (Nodule)
Microcrystalline Quartz (SiO2)
sedimentary