| 1 | Orthoquartzite | A very mature, quartz-rich sedimentary rock formed from sandstone; quartz grains are commonly well rounded and tightly cemented. | Usually white, gray, tan, or pale brown with a relatively uniform granular texture. | Building stone, paving, crushed aggregate, road base, and architectural masonry. | Generally hard and durable, but appearance and performance can vary with cement, porosity, and weathering. |
| 2 | Metaquartzite | Quartz-rich sandstone transformed by heat and pressure, producing tightly interlocking and recrystallized quartz grains. | Often white, gray, silver, or subtly banded, with a crystalline sparkle on broken surfaces. | Countertops, wall cladding, flooring, stairs, monuments, and high-wear architectural surfaces. | Its strength is commonly high, although mica-rich layers may reduce resistance to splitting or abrasion. |
| 3 | Pure Quartzite | Contains very little material other than quartz, giving it a compact structure and strong resistance to scratching. | Commonly bright white, cream, light gray, or translucent at thin edges. | Decorative stone, engineered aggregate, silica-rich industrial material, flooring, and interior cladding. | Its low impurity content creates a clean appearance but may also make staining or surface defects more visible. |
| 4 | Micaceous Quartzite | Contains visible mica minerals such as muscovite or biotite, which may create foliation and a reflective surface. | Silver, gray, beige, or greenish tones with glittering flakes and natural layering. | Feature walls, fireplaces, backsplashes, split-face cladding, garden walls, and decorative slabs. | Mica-rich planes can make the stone easier to split but may reduce suitability for heavy-traffic floors. |
| 5 | Ferruginous Quartzite | Contains iron-bearing minerals or iron oxides, commonly formed through weathering or mineral alteration. | Red, rust, orange, yellow, brown, or burgundy with streaks, bands, or mottled patterns. | Flagstone, exterior paving, retaining walls, landscape features, veneers, and rustic architectural work. | Iron-rich areas may weather or stain; sealing and suitability testing are recommended for wet or polished applications. |
| 6 | Garnet Quartzite | Includes garnet crystals formed during metamorphism, often embedded in a quartz-rich matrix. | Gray, pink, reddish, or brown with scattered dark red to deep brown garnet spots. | Decorative wall panels, fireplace surrounds, accent slabs, sculptures, and feature flooring. | Large garnet crystals can create a textured surface and may require careful finishing and edge treatment. |
| 7 | Green Quartzite | Gets its color from minerals such as chlorite, epidote, actinolite, or other green metamorphic components. | Pale sage, olive, forest green, or green-gray, sometimes with white or dark veining. | Kitchen and bathroom surfaces, wall cladding, paving, landscaping, shower walls, and decorative interiors. | Mineral content differs from one deposit to another, so absorption, etching, and finish performance should be tested. |
| 8 | Blue Quartzite | Blue coloration may be associated with minerals such as dumortierite, amphiboles, or other trace components within the quartz-rich rock. | Blue-gray, steel blue, or muted blue with white, gray, or darker mineral veining. | Statement countertops, backsplashes, fireplace surrounds, wall panels, and specialty architectural accents. | Color consistency can vary considerably; samples should be inspected under the intended lighting. |
| 9 | Conglomeratic Quartzite | A metamorphosed quartz-rich conglomerate with rounded pebbles or clasts cemented within a quartz-rich matrix. | Distinctive pebble-like patterns in gray, white, tan, pink, or multicolored tones. | Feature walls, fireplace surrounds, landscape masonry, public art, and dramatic interior accents. | The strength and polishability depend on how securely the individual clasts are bonded to the matrix. |
| 10 | Schistose Quartzite | Quartzite with a pronounced schistosity caused by aligned mica or other platy minerals, creating preferred splitting planes. | Layered gray, silver, brown, green, or gold surfaces with a naturally cleft texture. | Dry-stack walls, outdoor paths, garden steps, rustic cladding, flagstone, and textured landscape features. | Its attractive cleft surface may be uneven; thickness, slip resistance, and freeze-thaw performance should be checked before installation. |
