Tumbled dark pebble, likely basalt with pale mineral veins
Basalt (tentative); pale veins may be quartz or calcite
igneous
Category
Sedimentary Or Metamorphic Derived
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Pink quartzite pebble
Quartzite, predominantly SiO₂ with minor feldspar and iron-oxide staining
metamorphic
Rhodonite
Rhodonite (Manganese Iron Magnesium Calcium Silicate - Mn%,Fe%,Mg,Ca)SiO₃
mineral
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
mineral
Blue Apatite
Fluorapatite / Ca5(PO4)3F
mineral
Rhodonite
Rhodonite (Manganese silicate), (Mn,Fe,Mg,Ca)SiO3
mineral
Schist
Mica Schist (predominantly Muscovite or Biotite)
metamorphic
Hematite Nodule
Hematite (Alpha Fe2O3)
mineral
Greenstone pebble (likely altered basalt or serpentine)
Greenschist-facies mafic rock; commonly chlorite–actinolite–epidote ± serpentine
metamorphic
Serpentine (likely serpentinized ultramafic rock)
Serpentine-group minerals, chiefly antigorite, lizardite, or chrysotile; commonly derived from peridotite
metamorphic
Pink Quartz (Inclusion-rich Quartzite)
SiO2 (Silicon Dioxide) with Iron Oxide / Hematite inclusions
metamorphic
Green Aventurine
Silicon Dioxide with Fuchsite inclusions (SiO2 + K(Al,Cr)2AlSi3O10(OH)2)
metamorphic
Citrine Quartz
Silicon Dioxide (SiO2) with iron impurities
mineral
Mica Schist
Schist (muscovite-quartz dominant)
metamorphic
Yellow Jasper
Silicon Dioxide (SiO2) with iron impurities
mineral
Mica Schist
Mica Schist (predominantly Muscovite KAl2(AlSi3O10)(OH)2 and Quartz SiO2)
metamorphic
Rhodonite
Manganese Silicate (Mn,Fe,Mg,Ca)SiO3
mineral
Aquamarine
Beryl (Be3Al2Si6O18 with iron traces)
mineral
Serpentinite (serpentinized ultramafic rock), possibly with chromite
Serpentine-group minerals, chiefly lizardite and chrysotile; commonly derived from peridotite or pyroxenite, with possible chromite and magnetite
metamorphic
Weathered quartz-rich metamorphic pebble
Likely quartzite or quartz-rich schist; predominantly SiO₂ (quartz)
metamorphic
Fuchsite-bearing Quartzite (Green Quartzite)
Fuchsite (K(Al,Cr)2(AlSi3O10)(OH)2) in Quartzite
metamorphic
Biotite mica (likely)
Biotite, a mica-group mineral; approximate formula K(Mg,Fe)₃AlSi₃O₁₀(F,OH)₂
mineral
Chalcedony
Silicon Dioxide (SiO2)
mineral
Fancy Jasper
Silicon Dioxide (SiO2)
mineral
Red Jasper
Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3)
sedimentary
Yellow Jasper
Silicon Dioxide (SiO2) - Cryptocrystalline Quartz
sedimentary
Jasper
Silicon dioxide (SiO2)
sedimentary
Jasper (Liver Jasper or Chocolate Jasper)
Jasper (Silicate - SiO2)
sedimentary
Yellow Jasper
Silicon Dioxide (SiO2) with iron hydroxides (Goethite)
sedimentary
Jasper
Silicon Dioxide (SiO2)
sedimentary
Red Jasper
Jasper (Silicon Dioxide, SiO2 with Fe2O3 inclusions)
sedimentary
Chert (Nodular Chert)
Microcrystalline or Cryptocrystalline Silicon Dioxide (SiO2)
sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Hematite impurities
sedimentary
Red Jasper
Jasper (Silicon Dioxide) - SiO2
sedimentary
Red coral (polished coral beads)
Corallium spp.; chiefly calcium carbonate (CaCO₃, calcite)
gemstone
Schist
Crystalline Metamorphic Rock (Schistose)
metamorphic
Small gold-colored mineral crystal, likely pyrite
Pyrite (FeS₂), tentatively; native gold is a less likely alternative
mineral
Black Tourmaline
Schorl (NaFe2+3Al6(Si6O18)(BO3)3(OH)4)
mineral
Likely greenstone (metamorphosed basalt)
Greenschist or chlorite–epidote altered basalt; commonly composed of chlorite, epidote, actinolite, albite, and quartz
metamorphic
Oyster shell fragment
Ostreidae shell; primarily calcite (CaCO₃)
fossil
Schist
Schist
metamorphic
Ruby in Zoisite
Anyolite (Calcium Aluminum Silicate with Aluminum Oxide impurities)
metamorphic