Rock Identifier
Crushed Stone (Likely Limestone or Granite) (Calcium Carbonate (CaCO3) for Limestone / Quartz and Feldspar for Granite) — sedimentary or igneous
sedimentary or igneous

Crushed Stone (Likely Limestone or Granite)

Calcium Carbonate (CaCO3) for Limestone / Quartz and Feldspar for Granite

Hardness: 3-5 (Limestone) to 6-7 (Granite); Color: Grey, blue-grey, or white; Luster: Dull to vitreous; Crystal structure: Microcrystalline to coarse-grained; Angular cleavage resulting from mechanical crushing.

Hardness
3-5 (Limestone) to 6-7 (Granite)
Color
Grey, blue-grey, or white
Luster
Dull to vitreous
Identified More sedimentary or igneous →
Explore Crushed Stone (Likely Limestone or Granite) in the encyclopedia →

Identify your own rocks.

Get a report just like this from any photo, free.

App StoreGoogle Play

Physical properties

Hardness: 3-5 (Limestone) to 6-7 (Granite); Color: Grey, blue-grey, or white; Luster: Dull to vitreous; Crystal structure: Microcrystalline to coarse-grained; Angular cleavage resulting from mechanical crushing.

Formation & geological history

Formed through mechanical crushing of bedrock. Limestone forms in shallow marine environments; Granite forms from cooling magma deep underground. These are typically derived from Paleozoic to Mesozoic era formations.

Uses & applications

Used primarily as construction aggregate for road base, railway ballast, concrete, asphalt, and landscaping drainage.

Geological facts

Crushed stone is one of the most accessible and important geological materials for infrastructure globally. Most modern roads are built on a foundation of these fragments.

Field identification & locations

Identify in the field by its angular, sharp edges (man-made crushing) and uniform size distribution. Often found on gravel driveways, railway tracks, and construction sites.

More like this

Other sedimentary or igneous specimens

Pyrite (Iron Sulfide (FeS2)) — mineral

Pyrite

Iron Sulfide (FeS2)

mineral
Pebble (likely a type of sandstone or quartzite pebble) (Clastic Sediment (specifically, a rudite-sized clast). If the pebble is composed of a specific rock type, its scientific name would be that rock type (e.g., 'Quartzite pebble', 'Granite pebble', 'Chert pebble'). Given its appearance, it is likely a metamorphic quartzite pebble or a hard sandstone pebble.) — Sedimentary rock

Pebble (likely a type of sandstone or quartzite pebble)

Clastic Sediment (specifically, a rudite-sized clast). If the pebble is composed of a specific rock type, its scientific name would be that rock type (e.g., 'Quartzite pebble', 'Granite pebble', 'Chert pebble'). Given its appearance, it is likely a metamorphic quartzite pebble or a hard sandstone pebble.

Sedimentary rock
Quartz Vein in Host Rock (Silicon Dioxide (SiO2) within Sedimentary or Igneous Matrix) — igneous

Quartz Vein in Host Rock

Silicon Dioxide (SiO2) within Sedimentary or Igneous Matrix

igneous
Garnet (Garnet (X3Y2(SiO4)3)) — mineral

Garnet

Garnet (X3Y2(SiO4)3)

mineral
Gneissic Schist (Gneiss-schist (Metamorphic rock)) — metamorphic

Gneissic Schist

Gneiss-schist (Metamorphic rock)

metamorphic
Garnet in Host Rock (Garnet Group (A3B2(SiO4)3)) — metamorphic

Garnet in Host Rock

Garnet Group (A3B2(SiO4)3)

metamorphic