Calligraphy Stone
Fossiliferous Stromatolite Limestone (also known as Arabic Script Stone, Miriam Stone, or Elephant Skin Jasper)
sedimentary
Category
Mineral, Specifically A Rock Fragment
Browse mineral, specifically a rock fragment specimens identified by the Rock Identifier community.
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Basalt Fragment
Basalt (Aphanitic Mafic Igneous Rock)
igneous
Sandstone (Iron-stained)
Arenite with Limonite/Hematite staining
sedimentary
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Basalt with Quartz Veins
Mafic Igneous Rock with Quartz (SiO2) intrusions
igneous
Rounded gray stone, likely slate or fine-grained sandstone
Probable slate (low-grade metamorphosed shale) or lithic sandstone; exact identification requires testing
sedimentary
Sandstone (Weathered Pebble)
Sedimentary Rock (Quartz arenite)
sedimentary
Rounded iron-rich pebble
Likely hematite/goethite-bearing quartzite or ironstone; exact identification requires testing
mineral
Quartz (Vein Quartz)
Silicon Dioxide (SiO2)
mineral
Quartz / Chert
Silicon Dioxide (SiO2)
Mineral / Sedimentary
Himalayan Pink Salt
Halite (NaCl) with trace minerals
mineral
Sandstone
Arenite (SiO2 based)
sedimentary
Smoky Quartz and Chalcedony Geode Fragment
Silicon Dioxide (SiO2)
mineral
Vesicular basalt (probable)
Basalt, mainly plagioclase feldspar and pyroxene, with possible olivine and iron oxides
igneous
Chalcedony (Agate/Carnelian variant)
Silicon Dioxide (SiO2)
mineral
Crescent Pebble
Weathered Quartzite or Sandstone Fragment
sedimentary
Banded Gneiss
Gneiss (High-grade regional metamorphic rock)
metamorphic
Quartz Geode Fragment
Silicon Dioxide (SiO2)
mineral
Likely pale limestone or calcite-rich rock
Calcite-bearing limestone; chiefly calcium carbonate (CaCO₃)
sedimentary
Agate (Laguna or Lace variety pattern)
Silicon Dioxide (SiO2)
mineral
Fossil Bone Fragment
Petrified bone (permineralized hydroxyapatite)
fossil
Blue slag glass or dyed glass-like industrial material
Amorphous silicate glass; likely copper-bearing blue slag, but possibly colored man-made glass
mineral
Sandstone and River Pebbles
Sedimentary Rock (Sandstone / Quartzite / Chert)
sedimentary
Unidentified weathered rock fragment
Indeterminate; possibly vesicular basalt or weathered volcanic rock
igneous
Emerald in Matrix
Beryl (Be3Al2Si6O18) with Chromium/Vanadium impurities
mineral
Dalmatian Jasper
Peralkaline Quartz-Feldspar Porphyry with Arfvedsonite
igneous
Pink Granite
Phaneritic Felsic Intrusive Igneous Rock
igneous
Quartz (Milky / Clear Quartz Fragment)
Silicon Dioxide (SiO2)
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Pink Granite
Phaneritic Felsic Igneous Rock (Granite)
igneous
Concretion
Septarian concretion (likely containing Calcite or Siderite)
sedimentary
Unidentified dark green rock, possibly serpentinite
Serpentinite; chiefly serpentine-group minerals (Mg₃Si₂O₅(OH)₄), identification uncertain from the blurred image
metamorphic
Fossilized Trilobite or Mollusk Fragment
Phylum Arthropoda / Mollusca fossil in sedimentary matrix
fossil
Quartz Druzy (Geode Fragment)
Silicon Dioxide (SiO2)
mineral
Agate (Carnelian / Chalcedony)
Silicon Dioxide (SiO2)
mineral
Pink Granite
Granite (Phaneritic igneous rock rich in Alkali Feldspar and Quartz)
igneous
Pale blue-gray quartz-rich pebble (tentative)
Quartz, SiO₂, possibly chalcedony or a weathered metamorphic fragment
mineral
Quartz fragment
Silicon Dioxide (SiO2)
mineral
N/A (This is a digital image of a bar graph)
Digital Data Visualization (Bar Chart)
This is not a rock or mineral
Polished agate/geode fragment
Microcrystalline quartz (chalcedony), SiO₂, with possible calcite or quartz cavity lining
mineral
Conglomerate (Greenstone/Pebble Conglomerate)
Polymictic Conglomerate
sedimentary
K2 Jasper (K2 Granite)
Azurite in Granite (Biotite Granite with Azurite inclusions)
igneous