Quartzite is harder (Mohs 7 vs slate's 3–4), more heat-resistant, and better suited to Los Angeles's UV intensity and temperature swings. Slate costs less per square foot but requires more frequent sealing and is more prone to flaking over time. Both are beautiful natural stones — the right choice depends on your budget, maintenance tolerance, and whether you're installing near a pool.
Tegula Stone has installed both quartzite and slate patios across Los Angeles for over 35 years. Here is what the comparison actually looks like in practice — with real costs and maintenance expectations for the LA climate.
Both quartzite and slate are metamorphic rocks — formed under intense heat and pressure — but they differ significantly in mineral composition, hardness, and performance under outdoor conditions. Here is how they compare across the factors that matter most for a Los Angeles patio.
Quartzite is a metamorphic rock formed when sandstone is subjected to extreme heat and pressure, transforming the quartz grains into an interlocking crystalline matrix. The result is one of the hardest natural stones available for outdoor use — harder than granite in some varieties — with a beauty that ranges from pure white to rich gold, grey, and rust tones depending on mineral content.
Quartzite's Mohs hardness of 6–7 means it resists scratching from patio furniture, pets, and foot traffic far better than slate or limestone. In Los Angeles's outdoor environment, where patios endure year-round use and furniture is rarely moved indoors, this hardness translates directly to longer surface life. Quartzite surfaces show minimal wear even after 10–15 years of heavy use — a meaningful difference from softer stones that develop surface etching and wear patterns within 5–7 years.
Los Angeles summer temperatures can push patio surface temperatures above 130°F on full-exposure installations. Quartzite's crystalline structure handles thermal expansion and contraction well — it does not flake, chip, or delaminate under the UV and heat stress that affects softer stones. White or light grey quartzite reflects more solar radiation than dark stones, keeping surface temperatures 15–25°F cooler than black slate under identical sun conditions — an important comfort factor for barefoot pool and patio use in Southern California.
Quartzite requires penetrating sealer application every 3–5 years in LA conditions. The stone's low porosity means it resists staining well even between sealings, and its hardness means there is little surface degradation to address during routine maintenance. Annual cleaning with a pH-neutral cleaner and water is typically all that is required between sealings. For the full sealing process, see our guide to best sealers for natural stone pavers. Quartzite does not require special products — the same penetrating sealers used on bluestone and travertine perform well on quartzite.
Quartzite comes in a remarkable range of colors driven by mineral content: iron oxide creates gold and rust tones, chlorite creates green, and pure quartz produces brilliant white. Brazilian quartzite (Taj Mahal, Sea Pearl, White Macaubas) is among the most popular for LA patios, offering marble-like veining without marble's softness. Finishes include natural cleft (rough, rustic), honed (smooth, matte), and brushed (textured for slip resistance) — each changes the stone's visual character significantly.
Quartzite patio installation in Los Angeles runs $7,000–$15,000 for a 300 square foot project installed by a licensed contractor. The range reflects stone selection (imported Brazilian quartzite is more expensive than domestic), pattern complexity (simple running bond vs. irregular flagstone layout), and site preparation requirements (existing concrete removal, drainage work). Material costs alone average $8–$15 per square foot, with labor typically adding $6–$12 per square foot for a mortar-set installation. Contact Tegula Stone for a precise quote based on your specific site.
Quartzite excels in: pool surrounds and coping (hardness and low porosity make it pool-chemistry resistant); high-traffic patios where heavy furniture and pets are present; rooftop terraces (weight and thermal performance are manageable); and any installation where the homeowner wants to minimize long-term maintenance. Quartzite is less ideal for very irregular natural flagstone looks — it is typically sold in more regular shapes than slate or flagstone. For irregular natural layouts, see our flagstone patio installation guide.
Slate is a fine-grained metamorphic rock formed from compressed shale and clay minerals. It is prized for its natural cleft surface — the characteristic layered texture and color variation that no manufactured stone can replicate — and for its natural slip resistance even when wet. In Los Angeles, slate is most successful in shaded patios and covered outdoor areas where UV exposure is moderated.
Slate's natural cleft surface provides excellent slip resistance without additional finishing — the layered texture creates micro-grip points that work well barefoot or in wet conditions. This makes slate a popular choice for covered lanais, outdoor kitchens, and shaded patio areas where a natural, rustic look is desired. In high-sun LA applications, however, the same surface texture traps debris and requires more frequent cleaning than smoother stone surfaces.
Slate's color range is distinctive: deep charcoal grey, forest green, purple-grey, and black tones that read as sophisticated and dramatic. The natural cleft variation — no two slates look exactly alike — creates visual richness that suits both contemporary and traditional LA architecture. Over time in UV-exposed applications, slate color typically fades toward a lighter, more uniform grey; this is natural but can be minimized with consistent UV-resistant sealer application.
Slate's primary weakness is delamination — because it forms in layers, exterior forces (thermal expansion, freeze-thaw, and in LA, significant day-night temperature differentials) can cause the surface to split or flake. This is not a defect in the stone; it is a characteristic of how slate forms. In coastal LA neighborhoods where marine layer moisture cycles are significant, delamination can accelerate. Properly sealed slate in protected or shaded installations can last 15–25 years; unprotected slate on full-sun decks may begin showing surface issues within 5–8 years.
Slate is one of the more affordable natural patio stones in Los Angeles: $4–$8 per square foot for material, $5,000–$9,000 installed for 300 square feet. Indian multicolor slate (the most common type used in LA) is widely available through local stone suppliers. Brazilian slate offers richer tones at a slightly higher price point. Vermont slate — the domestic option — is the most expensive and least commonly used outdoors in Southern California.
Slate requires penetrating sealer reapplication every 1–2 years in LA conditions — more frequently than quartzite or bluestone because slate's porosity is higher and UV exposure degrades topical sealers faster. Color-enhancing sealers can revive the rich tones that UV fading diminishes, but they must be reapplied consistently to remain effective. Neglected slate in LA can begin showing efflorescence, surface staining, and delamination within 3–5 years of initial installation.
Slate performs best in: covered patios and outdoor kitchens where direct sun is blocked; poolside dining areas (away from the water's edge); interior-exterior transitions where the indoor and outdoor aesthetic should match; and contemporary or Japanese-inspired garden designs where dark, dramatic tones are the design goal. Avoid slate for: pool copings, direct pool surrounds, driveways, and any high-traffic area that will receive heavy furniture or commercial use. For a comparison with bluestone in similar applications, see our bluestone vs limestone guide.
Most Los Angeles homeowners who choose between quartzite and slate are weighing the lower initial cost of slate against the lower lifetime maintenance cost and longer lifespan of quartzite. The decision often comes down to budget and how the space will be used.
✓ Your patio is in full sun for most of the day
✓ The patio is adjacent to a pool or spa
✓ You want minimal maintenance (seal once every 3–5 years and forget)
✓ Heavy outdoor furniture, pets, or children will use the space regularly
✓ You want a 30–50 year lifespan without major resurfacing
✓ Budget allows for a higher initial investment in exchange for lower lifetime cost
✓ The patio is covered, shaded, or partially protected from direct LA sun
✓ You prefer dark, dramatic tones (charcoal, grey, forest green)
✓ Budget is the primary constraint and you're comfortable with annual sealing
✓ The project is a lower-traffic area (outdoor dining room, garden path)
✓ You want a natural, rustic cleft surface texture
✓ The installation is for an aesthetic purpose rather than high-use functionality
If neither quartzite nor slate fits your budget or aesthetic goals, consider: travertine (cool underfoot, excellent for pool surrounds, mid-range price), bluestone (extremely hard, cool tones, premium LA choice), or limestone (warmer tones, mid-range hardness, requires careful sealing). Tegula Stone can walk you through all your options during a free on-site consultation.
Tegula Stone has installed over 847 natural stone projects across Los Angeles. Tell us about your project and we'll recommend the right stone for your climate, budget, and design goals — free quote, no obligation.
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