Crushed stone: Characteristics
Three markets, three different ways to judge a rock
What this tab covers The supply and physical characteristics of the commodity. Supply: current production, inventories and stocks, capacity utilisation, geographic and producer concentration, how fast supply responds to price, the project pipeline and capital spending, and logistics and export flows. Material: the physical and chemical properties that set its grade, price and end uses (for example purity and conductivity for metals, API gravity, sulfur and energy content for fuels, moisture, protein and fibre quality for crops).Supply volume characteristics
| Characteristic | Figure | What it means | Source |
|---|---|---|---|
| Current production volume | no world total; US 1.5 billion t (2025e), worth $27 billion | About 70% of US crushed stone was limestone and dolomite, 14% granite and 6% traprock. World aggregate extraction is usually quoted with sand and gravel at about 43 Gt a year (Conway). | USGS MCS 2026; Conway (2023) |
| Inventory and stock levels | not published | Quarries and 180 US distribution yards hold working stockpiles of graded products. There are no exchange or strategic stocks; USGS rates reserves as adequate except for special types. | USGS MCS 2026 |
| Capacity utilisation | not published | US output has been flat at about 1.5 billion t since 2021 (1,510-1,550 Mt), from 3,500 quarries averaging about 0.43 Mt each. Spare capacity exists nationally; shortages are local near cities. | USGS MCS 2026 (average derived) |
| Geographic and producer concentration | very low by country; US has 1,400 companies; top-10 US states 56% | No world country split exists, so no HHI. Seaborne trade is more concentrated: Norway 11.0%, China 9.5% and Germany 9.3% of 2024 export value. Vulcan, Martin Marietta, CRH and Heidelberg Materials lead in the US; Vulcan shipped 226.8 million short tons in 2025, roughly 9% of US aggregates (derived). | USGS MCS 2026; UN Comtrade 2024; Vulcan 2025 results |
| Supply elasticity | short run high from existing quarries; long run low because new quarries near cities are hard to permit | Incumbent quarries have pricing power: the US average value rose from $13.26/t (2021) to $18.50/t (2025) while volume was flat. New quarries are pushed away from population centres, raising haul costs. | USGS MCS 2026; Tilton and Guzman 2016 |
| Project pipeline and CapEx | not published; demand supported by $56.8 billion of US federal-aid highway funding in FY2026 | The US Infrastructure Investment and Jobs Act expires at the end of FY2026. Data-centre, manufacturing and energy projects were expected to support 2026 demand. In India, crushers making 25,000-40,000 t a month are expanding to supply M-sand. | USGS MCS 2026; Indian Cement Review 2021 |
| Logistics and export flows | mostly trucked short distances; seaborne trade about $2.7 billion (2024 exports) | The US is 1% import reliant, importing 10 Mt in 2025 from Canada, Mexico, the Bahamas and Honduras, often by ship to coastal yards. Norway's coastal quarries ship to Europe. Singapore, Hong Kong and Kuwait import because they lack rock. Haulage, not quarrying, often sets delivered cost. | USGS MCS 2026; UN Comtrade 2024 |
Material characteristics Industrial mineral
Crushed stone serves three markets with different tests. Aggregate buyers want strong, durable, well-shaped particles that resist abrasion and weathering. Cement and lime kilns want chemical purity, mainly calcium carbonate with little magnesia or silica. Filler and chemical buyers want whiteness and fineness. The same quarry may sell to all three by splitting its rock.
| Property | Value / specification | Why it matters | Source |
|---|---|---|---|
| Crushing, impact and abrasion values | IS 383: crushing and impact values at most 30% for wearing surfaces, 45% otherwise; Los Angeles abrasion at most 30% and 50% | Weak stone breaks under traffic and loading; road and runway specs set the tightest limits | BIS IS 383:2016; IS 2386 Part 4; ASTM C131 |
| Soundness | sodium sulfate loss at most 12%, magnesium sulfate at most 18% after five cycles | Stone that cracks in freeze-thaw or salt attack ruins pavements | ASTM C33; BIS IS 383:2016 |
| Particle shape | combined flakiness and elongation index at most 40% | Cubical particles pack better and need less cement and bitumen | BIS IS 383:2016 |
| Calcium carbonate purity | cement-grade limestone usually above about 75-80% CaCO3; high-calcium lime and chemical grades above about 95% (indicative) | Sets whether rock can feed a kiln or flue-gas desulfurisation; high-purity stone is scarce in many regions | USGS MCS 2026 (scarcity); grade thresholds indicative |
| Magnesia (MgO) content | kept low for cement raw meal, since cement MgO is capped at 6% | Dolomitic stone suits aggregate but not cement | IS 269 / ASTM C150 |
| Specific gravity and absorption | about 2.6-2.9 specific gravity (indicative) | Used in mix design; high absorption stone is weaker and less durable | indicative engineering value |