Banded Jasper
Silicon Dioxide with Iron Oxide impurities (SiO2)
sedimentary
Category
Sedimentary (Alluvial Deposit)
Browse sedimentary (alluvial deposit) specimens identified by the Rock Identifier community.
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Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Conglomerate
Conglomerate (SiO2 dominant in clasts)
sedimentary
Chert (River Pebble)
Microcrystalline silica (SiO2)
sedimentary
Diamond
C (Carbon)
gemstone
Native Gold
Native Gold (Au)
mineral
River Pebble (Gneiss or Quartzite variant)
Metamorphic rock specimen (likely Quartzite or Gneiss)
metamorphic
Coarse Sand or Fine Gravel
Clastic Sediment (unconsolidated)
sedimentary
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Red Jasper
SiO2 (Silicon Dioxide with Hematite inclusions)
mineral
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Chalcedony (Agate Pebble)
Silicon Dioxide (SiO2)
sedimentary
Chert (and Agate/Chalcedony)
Microcrystalline Quartz (SiO2)
sedimentary
River Sandstone (Lithic Arenite)
Lithic Sandstone (SiO2 dominated with lithic fragments)
sedimentary
Chalcedony (Agate and Jasper Pebbles)
Microcrystalline Quartz (SiO2)
sedimentary
Tumbled Jasper
Silicon dioxide with impurities (Microcrystalline Quartz, SiO2)
sedimentary
Conglomerate
Conglomerate (Clastic Sedimentary Rock)
sedimentary
Quartz (Water-worn Pebbles)
Silicon Dioxide (SiO2)
mineral
Jasper and Mudstone Composite
Silicified Sedimentary Rock / Jasperoid Pebble
sedimentary
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Conglomerate
Polymictic conglomerate; rounded clasts cemented in a fine-grained matrix
sedimentary
Quartz Pebble
Silicon dioxide (SiO2)
sedimentary
Conglomerate
Conglomerate (SiO2 matrix with varying clasts)
sedimentary
Mixed river gravel (alluvial conglomeratic sediment)
Polymictic alluvium; composition includes quartz, feldspar, chert, granite, basalt, and metamorphic rock fragments
sedimentary
Petrified Wood
Silicified Wood (SiO2)
fossil
Quartz Pebble
Silicon dioxide (SiO2)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Conglomerate
Clastic sedimentary rock (Polymict conglomerate with quartz/calcite matrix)
sedimentary
Gold Nugget
Native Gold (Au)
mineral
Carnelian Bead
Silicon Dioxide (Chalcedony variety), SiO2
gemstone
Agate (Carnelian Agate with Quartz Matrix)
Silicon Dioxide (SiO2)
mineral
Quartz (Common or Milky)
Silicon Dioxide (SiO2)
mineral
Quartz-rich conglomeratic sandstone
Lithic arkose/conglomerate, dominated by quartz and feldspar grains
sedimentary
![Rough Diamond (or Quartz Crystal) (Carbon (C) [if Diamond] / Silicon Dioxide (SiO2) [if Quartz]) — mineral](https://media.rock.id/rough-diamond-or-quartz-crystal-b47280f1-d6ce-4d24-af2e-4d3e8d6ff671-thumbnail.jpg)
Rough Diamond (or Quartz Crystal)
Carbon (C) [if Diamond] / Silicon Dioxide (SiO2) [if Quartz]
mineral
Basalt with Chert or Jasper Inclusion
Igneous basalt / sedimentary chert nodule
igneous
Polymictic conglomerate
Conglomerate; clast-supported polymictic conglomerate in a dark matrix
sedimentary
Polygenetic Conglomerate (or Breccia)
Clastic Sedimentary Rock
sedimentary
Rounded sandstone pebble
Quartz-rich sandstone, possibly iron-stained litharenite
sedimentary
Jasper
Silicon Dioxide (SiO2) with impurities, Microcrystalline Quartz
sedimentary
Conglomerate (or Breccia)
Clastic Sedimentary Rock
sedimentary