Deep Blue Quartzite

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HardnessVery Hard(7–8 Mohs)

SoftHard

Acid SensitivityLow Risk

SafeHigh Risk

Verify Before You Buy

Slab Yard Diagnostic Protocol

Quartzite is widely mislabeled in the trade — slabs sold as quartzite are sometimes dolomitic marble (e.g., Super White) or hybrid marble/quartzite layers (e.g., Fantasy Brown). Before you commit, run two quick tests from your Stone ID Kit to confirm the slab is genuine quartzite.

From your Stone ID Kit

Glass tileHCl dropper bottle (5–10%)Knife or steel scribeMagnifier

The full step-by-step protocol — including expected results and red flags — is included in your downloadable Buyer's Guide.

Stone TypeQuartzite

Geological NameQuartzite

OriginBrazil

ASTM SpecificationASTM C616

ClassificationDense Crystalline / Siliceous

Available FinishesPolished, Honed (Matte), Leathered, Brushed

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ℹ️

Resin Fill Present

Like most Brazilian quartzites, Deep Blue Quartzite may contain polyester resin fill to stabilize the stone. In areas with significant direct sunlight, the resin can gradually yellow over time. Ask your supplier about the type of resin used — UV-stable epoxy resin is less prone to yellowing than standard polyester resin.

🔬

MB Stone I.D. Kit — Test Your Stone

Not sure what stone you have? This kit includes the tools professionals use to identify stone type, test acid sensitivity, check absorption, and determine the right care products.

Shop Stone I.D. Kit — $139.97

HardnessVery Hard(7–8 Mohs)

SoftHard

Acid SensitivityLow Risk

SafeHigh Risk

LOW — siliceous; generally acid-resistant

🔥Heat Tolerance

>480°F (250°C)

💧Sealer

Yes (impregnator)

Technical Details

ASTM SpecificationASTM C616

Mohs Hardness7–8

Absorption0.05–0.40%

Density (pcf)150–175

Compressive Strength (psi)10,000–40,000+

Flexural Strength (psi)≥1,200

Abrasion Resistance (Ha)≥8

Thermal Tolerance>480°F (250°C)

ClassificationDense Crystalline / Siliceous

Geological NameQuartzite

OriginBrazil

Where can you use Deep Blue Quartzite?

Tap an application to see the full recommendation.

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Interior

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Exterior

Recommended Conditional Not Recommended

Care Instructions

Maintenance recommendations for Deep Blue Quartzite

🧹 Daily Cleaning

Wipe surfaces with a soft, damp cloth or microfiber towel
Use a pH-neutral stone cleaner — never use acidic or abrasive products

💧 Sealing Schedule

Sealer type: Yes (impregnator)
Seal every 1–2 years for normal residential use
Test with water drops — if absorption occurs within 10 minutes, it's time to reseal
Always clean the surface thoroughly before applying sealer
Allow sealer to cure fully before using the surface (typically 24 hours)