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Apophyllite from India: Inside Deccan Crystal Cavities

By Digital Towns Crystals ยท Last reviewed October 1, 2026

Short answer: most apophyllite on the market comes from western India, where it grew inside hollow pockets in ancient lava flows. The lava came first. The crystals came later, deposited by mineral-rich water moving through the rock.

The host rock

The Deccan volcanic province covers a large part of western and central India. It is built from layer upon layer of basalt lava that erupted around 66 million years ago. As the lava cooled, gas escaping from it left bubbles and open pockets in the rock.

How the crystals grew

Long after the lava hardened, water moved through the basalt. It dissolved elements from the rock and carried them into the open cavities. As conditions changed, minerals came out of solution and grew on the cavity walls, often in more than one stage.

That is why a single specimen can carry several minerals. They are chapters of the same history, laid down one after another in the same pocket.

Apophyllite

Apophyllite forms blocky or pyramid-tipped crystals that are colorless, white, or green. The faces are glassy and bright. It also splits cleanly in one direction, and that flat cleavage surface has a softer, pearly shine. Seeing both kinds of luster on one crystal is a useful clue.

Stilbite, its usual partner

Stilbite is a zeolite, a family of minerals common in these cavities. It often grows as peach, pink, or cream crystals bundled together in a sheaf or bow-tie shape. Peach stilbite beside clear or green apophyllite is the classic Deccan combination.

Apophyllite is found with zeolites and is often sold alongside them, but it is not a zeolite itself.

What to look for

  • Clean, bright crystal faces with sharp tips.
  • Contrast between minerals, such as clear apophyllite on peach stilbite or on dark basalt.
  • Matrix. A piece still on its host rock shows how it grew.
  • Stated locality. Regional geology explains the type. The listing should say what is documented for that piece.
  • Weight and dimensions. Cabinet specimens can be heavy.

Handling and care

These are among the more delicate specimens to own.

  • Apophyllite is about 4.5 to 5 on the Mohs scale and cleaves easily. Stilbite is softer.
  • Lift by the matrix, never by the crystals.
  • Dust with a soft brush or gentle air.
  • Keep away from heat. Apophyllite holds water in its structure and can flake when heated.
  • Skip ultrasonic cleaners.

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