Likely serpentinized ultramafic rock (serpentinite)
Serpentinite; chiefly serpentine-group minerals, Mg₃Si₂O₅(OH)₄, possibly with magnetite, chromite, and brucite
metamorphic
Category
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Agate (various color varieties)
SiO₂ (Silicon Dioxide)
Mineral (specifically a variety of Chalcedony, which is a microcrystalline quartz)
Unakite (polished/tumbled)
Unakite, a hydrothermally altered granite composed mainly of epidote, pink potassium feldspar (orthoclase/microcline), and quartz
metamorphic
Pink quartz bead strand (likely rose quartz or pink dyed quartz)
Quartz, silicon dioxide (SiO₂); probable rose quartz variety, possibly dyed or treated quartz/chalcedony
mineral
Fluorite
Calcium Fluoride (CaF2)
Mineral
Blue Quartz
Quartz (SiO2) with inclusions
Mineral
Rose Quartz (tumbled)
Rose Quartz (variety of Quartz, chemical formula SiO₂)
Mineral
Rose Quartz
Rose Quartz (SiO₂)
mineral
Zebra Jasper
Silicon dioxide (SiO2) with various impurities
Sedimentary
Rose Quartz
Silicon dioxide (SiO2) with trace impurities of titanium, iron, or manganese
mineral
Rose Quartz
Rose Quartz (SiO2)
Mineral
Fossilized Wood (Petrified Wood)
Silicified Wood (primarily quartz/chalcedony replacing organic matter)
Sedimentary (with some aspects of mineral replacement)
Calcite
Calcite (CaCO 3)
Mineral
Polished white agate or chalcedony bead
Microcrystalline quartz (SiO₂), likely chalcedony/agate with iron-oxide staining or a brown mineral inclusion
gemstone
Granite
Granite (a common rock name, not a single mineral species, composed primarily of quartz, feldspar, and mica/amphibole)
igneous
Jasper
Silicon Dioxide (SiO2)
Mineral
Onyx Marble (also commonly called Onyx)
Calcite (CaCO3), often with other mineral impurities
Sedimentary Rock (specifically a type of Travertine)
Jasper
Silicon Dioxide (SiO2) - a variety of Chalcedony (Cryptocrystalline Quartz)
Mineral
Polished multicolored jasper
Jasper, an opaque microcrystalline variety of quartz (SiO₂), likely iron- and manganese-stained chert
mineral
Weathered sandstone pebble
Quartz-rich sandstone, likely ferruginous sandstone
sedimentary
Sodalite
Sodalite (Na4Al3Si3O12Cl)
Mineral
Rose Quartz
Rose Quartz (SiO₂)
Mineral
Rose Quartz
Rose Quartz (SiO2)
Mineral
Bivalve Shell (Fossil or Contemporary)
Class Bivalvie (various genera and species of clams, cockles, etc.)
Sedimentary (Biogenic sediment or biological remain)
Moss Agate
Moss Agate (a variety of Chalcedony, SiO ₂)
Mineral (specifically a variety of Chalcedony, which is microcrystalline Quartz)
Azurite-Malachite (often called Azerite Malachite or Azurmalachite)
Azurite (Cu3(CO3)2(OH)2) and Malachite (Cu2CO3(OH)2)
Mineral
Larimar
Pectolite (a blue variety of Pectolite)
Mineral
Polished orbicular jasper / brecciated jasper
Jasper, microcrystalline quartz (SiO₂), with iron-oxide and clay-rich inclusions
sedimentary
Rose quartz cabochon (probable)
Quartz, silicon dioxide (SiO₂); pink color typically caused by trace elements and microscopic inclusions
gemstone
Amazonite
KAlSi3O8 (Potassium Aluminum Silicate) - a variety of Microcline Feldspar
mineral
Amber (Black)
Amber (succinite, retinite, etc., specifically, heavily included/dark varieties)
Mineraloid
Carnelian
Chalcedony (cryptocrystalline quartz), SiO2 (Silicon Dioxide)
Mineral
Quartz (likely milky/rose quartz variety)
Quartz (SiO2 - Silicon Dioxide)
Mineral
Carnelian (Chalcedony variety)
SiO2 (Silicon Dioxide)
Mineral
Chevron Amethyst
Quartz (SiO2) with patterned Amethyst and White Quartz/Milky Quartz
mineral
Hematite (beads)
Hematite (Fe₂O₃)
Mineral
Polished brecciated jasper
Jasper, an opaque microcrystalline quartz variety (SiO₂), with iron-oxide and clay/mineral inclusions
gemstone
Carnelian (red chalcedony), possibly red agate or jasper
Chalcedony, a microcrystalline variety of quartz; silicon dioxide (SiO₂), commonly colored red-orange by iron oxides. The specimen may include opaque jasper or agate zones.
gemstone
Bloodstone
Heliotrope (a variety of Chalcedony, SiO₂ with inclusions)
Metamorphic Rock
Amethyst
Quartz variety; chemical formula: SiO₂ (silicon dioxide) with Fe³⁺ impurities
Mineral
Onyx (beads)
SiO2 (Cryptocrystalline Quartz)
Mineral
Peridot
Olivine (Mg,Fe)2SiO4
Mineral