Organic (Geological Interest)

Sandstone with Quartz Vein

Arenite with hydrothermal quartz intrusion

Siltstone

Siltstone (composed of microscopic quartz and clay minerals)

Weathered iron-rich basalt or laterite

Basalt, likely limonitized/goethite-stained; exact identification requires testing

Concretion or weathered iron-rich rock

Likely limonite/goethite-rich concretion; exact identification requires testing

Weathered quartz-rich rock, possibly milky quartz or quartzite

Quartz (SiO₂); likely quartzite if the granular texture is recrystallized sandstone

Fluorite-Gedrite in Quartz (Schist)

Fluorite (CaF2) with Gedrite in Quartz/Feldspar Matrix

Native gold-bearing quartz/ore fragment

Native gold (Au) with quartz (SiO₂), possibly sulfide-associated

Peridotite

Ultramafic igneous rock (primarily olivine and pyroxene)

Likely iron-rich rock or metallic mineral fragment

Uncertain; possibly limonite/goethite-rich material or weathered iron meteorite fragment

Schist with Quartz/Mica

Mica Schist (primarily Muscovite and Quartz)

Small dark mineral/rock fragment

Indeterminate; possibly magnetite-bearing basalt or iron-rich slag

Granite featuring Quartz Vein

Granite with hydrothermal silica (SiO2) intrusion

Weathered sandstone pebble

Quartz-rich sandstone, likely ferruginous sandstone

Orange sandstone or iron-stained quartz-rich rock

Quartz arenite to arkosic sandstone; primarily SiO₂ with iron-oxide cement

Epidote

Epidote (formula: Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH))

Ironstone Concretion

Siderite or Hematite Concretion

Iron-rich river pebble (likely weathered basalt or ironstone)

Indeterminate; possibly ferruginous basalt, hematite-rich ironstone, or limonite-coated mafic rock

Iron-rich basalt or hematitic volcanic rock

Basalt, likely Fe-oxide-bearing; exact identification requires testing

Weathered quartz-bearing rock, possibly druzy quartz or quartzite

Quartz (SiO₂), likely in a quartz-rich host rock; exact identification is uncertain from the photograph

Possible weathered metal-rich rock or slag fragment

Uncertain; possibly iron-oxide-rich breccia or industrial slag

Quartz (Iron-stained Pebble)

Silicon Dioxide (SiO2)

Pink Coral

Corallium rubrum (Calcium Carbonate, CaCO3)

Tumbled yellow quartz (likely iron-stained quartz)

Quartz, silicon dioxide (SiO₂), with iron-oxide staining and possible minor inclusions

Vesicular basalt (scoria-like volcanic rock)

Basalt, a mafic volcanic rock composed mainly of plagioclase feldspar, pyroxene, and minor olivine

Polished/polished rough quartz crystal, likely hematoid or included quartz

Quartz (SiO₂), with probable iron-oxide inclusions; possibly smoky or rose-tinted quartz

Weathered iron-stained quartz-rich rock, possibly rhyolite or quartzite

Indeterminate silica-rich rock; likely quartz (SiO₂) with iron oxides and clay alteration

Granite fragment (tentative)

Granite; primarily quartz (SiO₂), feldspar, and mica

Rounded quartz-rich pebble

Likely quartzite (mostly quartz, SiO₂); exact identification is uncertain from the photo

Iron Ore / Hematite Rock

Iron oxide (primarily Hematite, Fe2O3)

Naga Silver-Inlaid Ebony and Bone/Horn Beads

Diospyros (Ebony) or Keratin (Horn) with Silver/White-Metal Inlay

Rounded river pebble

Indeterminate; likely quartz-rich sandstone, chert, or weathered volcanic rock

Blue calcite-rich marble or limestone

Calcite (CaCO₃), likely recrystallized as marble; possibly aragonite-bearing limestone

Weathered quartz-rich metamorphic rock, likely quartzite

Quartzite (mostly microcrystalline SiO₂), possibly iron-stained mica-bearing quartzite

Likely quartz-rich pebble fragment

Quartz (SiO₂), possibly milky quartz or quartzite; the photo is insufficient to distinguish them confidently

Reddish-brown crystalline rock, possibly weathered granite or garnet-bearing schist

Indeterminate; likely quartz–feldspar–mica rock with iron oxides, potentially garnet-bearing

Red-and-white porphyritic granite fragment

Granite, likely alkali-feldspar granite; quartz + feldspar with minor mafic minerals

Seashell Fragment

Calcium carbonate (CaCO3) - primarily Aragonite or Calcite

Milk Quartz (or Milky Quartz)

Silicon Dioxide (SiO2)

Conglomerate

Polymictic conglomerate; clast-bearing sedimentary rock cemented by silica, calcite, or iron oxides

Quartz-rich metamorphic rock, likely quartzite

Quartzite; predominantly crystalline SiO₂ with minor feldspar, mica, and iron-oxide minerals

Fossiliferous limestone pebble

Bioclastic limestone, chiefly calcite (CaCO₃)

Amber

Resinite / Fossilized Tree Resin