Rough Zebra Calcite (Mexico) – 1.6–2.5”

Important Note: Zebra Calcite is softer (Mohs hardness ~3) than quartz or agate. It requires extra care, shorter runs, and gentler grit stages to avoid chipping or over‑rounding.

Step 1 – Rough Stage (Coarse Grind)

• Use 80 silicon carbide grit.

• Run for 5–7 days only (shorter than harder stones).

• Check frequently — Zebra Calcite shapes quickly.

• Rinse thoroughly between stages.

Step 2 – Medium Grind

• Use 220 grit.

• Run for 5–7 days.

• This stage smooths edges without removing too much material.

• Inspect daily to prevent over‑rounding.

Step 3 – Fine Grind / Pre‑Polish

• Use 400 grit.

• Run for 4–6 days.

• Stones should feel silky smooth to the touch.

• Wash barrel and stones carefully to avoid contamination.

Step 4 – Polish

• polish with pumice or aluminum oxide or cerium oxide.

• Run for 5–7 days.

• Zebra Calcite takes on a soft, satiny shine rather than a glassy finish.

• Optional: Add plastic pellets to cushion stones during polish.

Step 5 – Burnish (Optional)

• Run stones with soap flakes or borax and water for 4–6 hours.

• This cleans residues and enhances the final luster.

Tips for Success

• 🪨 Patience pays off: Zebra Calcite polishes more softly than quartz, but its banding looks stunning when finished.

• 🌊 Avoid over‑tumbling: Too long in coarse grit can reduce size dramatically.

• 🧼 Clean thoroughly between stages to prevent grit contamination.

• 🪴 Use cushioning media (ceramic or plastic pellets) to protect softer calcite from chipping.