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Hello All
Unfortunately Covid is again on the rise, in Evanston.
Although not mandatory, masks are highly recommended.
Thank you!’
QUICK FACTS:
Location: India
Chemical Composition: (K,Na)Ca4Si8O20(F,OH) - 8H2O
(Hydrated Potassium Calcium Sodium Silicate Fluoride Hydroxide)
Hardness: 4½ - 5