31 Mar A Look At Domestic Quarries
Where TERRAZZCO Stone Begins: A Look at Domestic Quarries
Path of Stone Series
When a terrazzo floor is finished, most people only notice the shimmer of the aggregates or the speckled pattern of the chips. But every chip has an origin story, and not all stones are created equal. Where that stone comes from determines everything that follows: consistency, lead times, environmental impact, and ultimately, the success of your project.
At Concord Terrazzo Company, we’ve made a strategic choice to focus on domestic sourcing for TERRAZZCO Brand Aggregates. While much of the industry defaults to imported aggregates, often sourced in locations like China and Italy, we’ve built our supply chain differently. Our aggregates are sourced regionally, then crushed and processed right here at our facility in Charlotte, North Carolina.
This post is the first of our Path of the Stone series. We’re pulling back the curtain to help architects and contractors understand where our aggregates come from and why sourcing domestic materials is advantageous for your projects.
America Has More Stone Than Most People Realize
The United States is home to the most diverse and abundant stone resources in the world. Domestic quarries produce an excellent range of colors, textures, and performance characteristics for the end product. However, these products are often overlooked. The design world frequently defaults to imported goods like the exotic marbles of Carrara or the travertines of Turkey, that dominate product libraries
In reality, the United States has hundreds of working quarries across the majority of states:
- Granite accounts for a massive share of annual aggregate production
- Marble quarries operate in several key states such as Vermont, Georgia, Tennessee, Alabama, Colorado, and Missouri
- Limestone runs deep through Indiana, Minnesota, and Wisconsin.
This abundant resource base allows us to source high-quality domestic aggregates to support options for terrazzo floors.
Our domestic selection includes marble, granite, and glass chips. (Not every stone is suitable for terrazzo; softer stones like limestone, for example, can absorb contaminants and wear prematurely, which is why we do not source them).
How TERRAZZCO Select Aggregates
For terrazzo aggregates, we select materials with our clients, the architects, and installers in mind. We look for stones that crush cleanly, hold color consistency, and are easily ground and polished. However, not every stone is suitable for terrazzo. Our team evaluates aggregates based on several criteria:
- Availability: We ensure the quarry can supply the material consistently for years to come.
- Color Consistency: We select batches that provide predictable, repeatable color profiles that architects can rely on.
- Hardness & Abrasion Resistance: Terrazzo must endure decades of foot traffic. We test for Mohs hardness and durability.
- Chemical Stability: Some aggregates react negatively with cement or epoxy binders. We screen materials to ensure compatibility.
- Aesthetic Character: We look for unique visual appeal and long-lasting beauty that meets market demand.
Why Harness & Uniformity Matter in Mix Design
When aggregates with varying hardness levels are combined in a single mix, softer materials will wear down faster, creating an uneven surface.
For this reason, we emphasize uniform hardness within each mix design. Selecting aggregates maintains a consistent Mohs hardness to achieve a long-lasting floor, especially critical in high-traffic areas such as airports, hospitals, and schools.
Why Domestic Aggregates Sourcing is Better
Choosing domestic aggregates changes the project experience for architects, contractors, and building owners. Here is why it makes a difference:
Supply Chain Visibility and Consistency
When aggregates travel across oceans, quality control becomes fragmented. By the time imported stones reach a job site, verifying their origin, extraction method, or batch consistency is difficult.
With domestic sourcing, Concord Terrazzo works directly with quarry operators. For TERRAZZCO Brand Products, we monitor quality from the source through crushing, processing, and packaging at our in-house facility. This translates to consistent color, sizing, and cleanliness, batch after batch.
No Tariffs, No Exchange Rate Volatility
Imported materials are subject to complicated tariff schedules and trade policy changes. Chips from overseas carry duty rates up to 6.5%, and transportation can account for 15-30% of total material costs.
Domestic materials eliminate these variables. No tariffs. No unexpected surcharges. No delays. For architects managing budgets and contractors pricing jobs months in advance, this predictability is a significant financial advantage. Thus, domestic aggregates can keep projects on schedule and within budget range.
Reduced Embodied Carbon
Transporting aggregates from a regional quarry to Concord Terrazzo’s crushing facility means a few hundred miles by truck, not a 10,000-mile ocean voyage. This drastically lowers the embodied carbon of the material.
As green building certifications like LEED v5 evolve to place greater emphasis on embodied carbon (including transportation), sourcing distance becomes a specification-level decision. TERRAZZCO aggregates are sourced within 500 miles of our manufacturing facility, helping project teams earn credits for responsibly sourced materials.
Working Domestic Aggregates into Terrazzo
Terrazzo is defined by the aggregates displayed at its surface. When you design with domestic stone, the regional identity becomes part of the floor’s character.
- An architect in the Southeast can specify marble chips quarried from the Appalachian Belt. Mt. Airy, NC, is known as “granite city” and has one of the largest granite quarries operating today. In Alabama, white and light-gray decorative stones are more common.
- Up Northeast, in Vermont, stones range from white to subtle gray veining, remaining one of the most domestic marbles in the world.
This approach aligns with a broader movement toward sustainable, region-centric design. There are plenty of unique colors to explore.
Ultimately, our goal is to help architects achieve their vision. While we specialize in domestic materials, we can source specific colors and sizes, whether domestic or imported, to support the architect’s design intent. Concord Terrazzo Company offers a wide selection of terrazzo chips to achieve a truly one-of-a-kind appearance.
What This Looks Like in Practice
Our facility sources exclusive raw materials within 500 miles of Charlotte, North Carolina. We maintain a network of aggregate producers that provide a wide variety of stone offerings.
Because we crush, grade, and process these materials ourselves, Concord Terrazzo controls the gradation, color uniformity, and cleanliness of every aggregate we package and ship. When you order from us, you’re getting a quality product that can be traced to its source and delivered without interruptions.
Coming Up in the Path of the Stone Series
In future installments, we’ll go deeper into the differences between domestic vs imported materials, walk you through our crushing process, and highlight real projects where domestic aggregates made a significant design difference.
Ready to specify domestic aggregates for your next project?
Contact the TERRAZZCO team to discuss aggregate selection, regional availability, and sample requests. We’ll work directly with architects and contractors throughout the specification and procurement process.