Tumbled quartz-rich pebble
Microcrystalline quartz (SiO₂), possibly milky quartz or chalcedony
mineral
Category
Metamorphic (Modified)
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Milky quartz (iron-stained quartz)
Quartz, silicon dioxide (SiO₂)
mineral
Polished ruby-in-fuchsite (tentative)
Fuchsite mica with corundum (ruby), commonly in quartzite or mica schist
metamorphic
Quartz-rich rock, possibly quartzite
Quartzite (dominantly quartz, SiO₂); identification is provisional from the photo
metamorphic
Tumbled brown tourmaline
Dravite–schorl tourmaline, complex borosilicate; approximate formula Na(Mg,Fe)₃Al₆(BO₃)₃Si₆O₁₈(OH)₄
mineral
Likely clear quartz pebble or glassy quartz fragment
Quartz (silicon dioxide, SiO₂)
mineral
Magnetite
Magnetite (Iron(II,III) oxide, Fe3O4)
mineral
Greenschist
Greenschist facies metamorphic rock
metamorphic
Ruby in Zoisite (Anyolite) or Tumbled Dyed Agate/Quartzite
Zoisite with Corundum (Al2O3 + Ca2Al3(SiO4)3(OH))
metamorphic
Zoisite with Rubellite (Ruby in Zoisite)
Zoisite with inclusions of Hornblende (Anyolite)
metamorphic
Muscovite
Muscovite (KAl2(AlSi3O10)(OH)2)
mineral
Zoisite with Ruby
Anyolite (Calcium aluminum hydroxy silicate with Corundum) Ca2Al3(SiO4)3(OH)
metamorphic
Fuchsite in Quartz
K(Al,Cr)2(AlSi3O10)(OH)2 in SiO2
Metamorphic Rock / Mineral Association
Rhodonite
Manganese Silicate (Mn,Fe,Mg,Ca)SiO3
mineral
Rhodonite
Rhodonite (Mn,Fe,Mg,Ca)SiO3
mineral
Quartz-Veined Slate or Greenstone
Metamorphic rock with quartz vein (SiO2)
metamorphic
Fuchsite
Fuchsite (a variety of Muscovite mica, K(Al,Cr)2(AlSi3O10)(OH)2)
mineral
Likely quartz-rich stone (possibly quartzite)
Quartzite, composed predominantly of quartz (SiO₂)
metamorphic
Quartz vein fragment
Quartz, silicon dioxide (SiO₂), likely milky to translucent quartz with iron-oxide or clay inclusions
mineral
Quartz-rich rock, possibly milky quartz or quartzite
Quartz (SiO₂); if quartzite, recrystallized quartz sandstone
metamorphic
Likely quartz-rich stone (possibly milky quartz or quartzite)
Quartz, silicon dioxide (SiO₂), or quartzite if interlocking grains are present
mineral
Dark gray metamorphic rock fragment
Likely slate or fine-grained schist; mineral composition cannot be confirmed from the image
metamorphic
Banded gneiss pebble
Gneiss, likely quartz–feldspar–mica gneiss
metamorphic
Banded Gneiss
Gneiss (SiO2 enriched metamorphic rock)
metamorphic
Greenstone
Metamorphic Greenstone (Greenschist facies)
metamorphic
Pyrite Schist
Metamorphic rock containing FeS2 (Pyrite) with mica and quartz
metamorphic
Greenschist
Greenschist (containing Chlorite, Epidote, and Actinolite)
metamorphic
Eclogite
Eclogite (Omphacite-Garnet Rock)
metamorphic
Gneissic Schist
Gneiss-schist (Metamorphic rock)
metamorphic
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Slate
Slate (foliated metamorphic rock)
metamorphic
Dark slate or fine-grained metamorphic rock
Slate; chiefly fine-grained phyllosilicates, quartz, and feldspar
metamorphic
Quartz vein in foliated metamorphic rock
Likely quartz-bearing schist or gneiss; visible crystal is quartz (SiO₂)
metamorphic
Prehnite
Prehnite (Ca2Al2Si3O10(OH)2)
mineral
Milky Quartz Pebble
Silicon dioxide (SiO2)
mineral
Morganite (Pink Beryl)
Beryl (Be₃Al₂Si₆O₁₈:Mn)
gemstone
Sandstone or Quartzite
Sandstone or Quartzite (SiO2 primarily)
sedimentary or metamorphic
Quartz with Inclusions
Silicon Dioxide (SiO2)
mineral
Galena
Lead Sulfide (PbS)
mineral
Clear Quartz (Faceted Crystal)
Silicon Dioxide (SiO2)
mineral
Ruby
Corundum (Al2O3 with chromium trace elements)
gemstone
Blue Apatite
Ca5(PO4)3(F,Cl,OH)
mineral