Slate
Black Slate
China / India
Slate
Purple Slate
Wales / India
ASTM C629Heat ResistantFrost ResistantAcid SensitiveSofter Surface
Purple Slate
Photo coming soon
HardnessMedium(2.5–4 Mohs)
SoftHard
Acid SensitivityModerate Risk
SafeHigh Risk
Verify Before You Buy
Slab Yard Diagnostic Protocol
Run a quick verification with your Stone ID Kit to confirm the slab matches its label. The two-test routine (scratch + acid) catches most identification errors in the trade.
From your Stone ID Kit
Glass tileHCl dropper bottle (5–10%)
The full step-by-step protocol — including expected results and red flags — is included in your downloadable Buyer's Guide.
Stone TypeSlate
Geological NameSlate
OriginWales / India
ASTM SpecificationASTM C629
ClassificationSiliceous (most)
Available FinishesHoned (Matte), Brushed
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Natural Cleft Surface
Slate can be left with its natural cleft (split) surface for a textured, organic look, or gauged/calibrated for a flatter profile. Natural cleft provides excellent slip resistance for exterior use.
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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 — $139.97Alternatives to Purple Slate
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