Overview

“Apophyllite” is the collector’s term for the apophyllite group, most commonly represented by fluorapophyllite-(K). Beloved for its brilliant glassy luster, sharp tetragonal form, and dramatic associations with zeolites, apophyllite is one of the most display-worthy minerals from basalt cavities. Crystals are typically square to rectangular prisms with steep pyramidal terminations, often colorless to white, but sometimes apple-green, mint, or even rare peach. Classic “fish-tail” twinning, outstanding transparency, and mirror-bright faces give top specimens a jewel-like presence.

Most fine pieces come from the Deccan Traps of India, where apophyllite occurs with stilbite, heulandite, scolecite, okenite, mesolite, cavansite, and others. New Jersey traprock quarries in the USA produced historic classics with thick, lustrous crystals on prehnite or datolite. Because of its perfect basal cleavage (the name derives from “to flake off”), apophyllite is deceptively fragile; pristine terminations and undisturbed clusters are especially prized. The best green crystals from Jalgaon and Pune districts can be breathtaking centerpieces, while large, sparkling plates of colorless apophyllite remain accessible and highly decorative.

Popularity

Apophyllite sits at the crossroads of accessibility and show-stopping beauty. India’s prolific basalt quarries made top-quality material widely available from the 1990s onward, fueling global enthusiasm. Collectors appreciate:

• Striking aesthetics: water-clear or vivid-green crystals, bright luster, and textbook form.
• Superb associations: apophyllite on snow-white stilbite, sprays of scolecite, or with blue cavansite from the Pune area.
• Size range: from delicate thumbnails with perfect fish-tail twins to wide cabinet plates covered in mirror-bright crystals.

Historic specimens from New Jersey’s Prospect Park and Upper New Street quarries are coveted for their provenance and robust crystal habit. Meanwhile, modern Indian finds continue to define the standard for color, clarity, and composition, ensuring apophyllite’s enduring appeal to both new and advanced collectors.

Top Collecting Localities

Below are renowned sources whose productions are especially prized by collectors. Each locality is represented with maps and example galleries to help you recognize their “look.”

Jalgaon District, India

Jalgaon District is famed for world-class green apophyllite—the benchmark for saturated, uniform apple-green color. Crystals range from stout to elongated, commonly perched on stilbite or heulandite for gorgeous white-on-green contrast. Many are remarkably transparent, with vivid color seen even without backlighting. Flats from Jalgaon often contained consistent, fine pieces, making it the go-to source for collectors seeking top green apophyllite clusters or single, gemmy prisms with “jewel” terminations.

Nashik District, India

Nashik (Nasik) District quarries have produced excellent apophyllite plates—typically colorless to pale green—featuring mirror-bright faces and sharp terminations. Often in large, sparkling carpets on basalt with stilbite, these pieces excel as cabinet displays with broad coverage and strong luster. Fish-tail twins and fine, undamaged tips appear with some frequency. Though color saturation may be subtler than Jalgaon or Wagholi, the sheer brilliance and crisp form make Nashik pieces highly desirable.

Collector’s Guide

Evaluating Specimen Quality

• Color and Transparency:

  • Colorless, water-clear crystals with bright luster are highly desirable.
  • Green apophyllite commands a premium; the most prized are vivid, uniform apple-green crystals from Jalgaon or Wagholi.
  • Mild pastel or zoned greens can still be excellent if luster and clarity are strong.
  • Avoid crystals that look milky or heavily cracked unless compensated by exceptional size or composition.

• Crystal Form and Terminations:

  • Look for sharp tetragonal prisms with clean, lustrous pyramidal tips.
  • Fish-tail twinning is a classic and collectible feature when well-defined and undamaged.
  • Thick, blocky New Jersey habits and slender, gemmy Indian prisms are both valued—judge by symmetry and crispness.

• Luster:

  • Apophyllite at its best has mirror-bright, highly reflective faces. Dull or frosted faces (unless naturally interesting) reduce impact.

• Matrix and Associations:

  • Strong contrasts add value: green or clear apophyllite on white stilbite, scolecite sprays, or clean basalt matrix.
  • Coveted combinations include apophyllite with cavansite (Pune area), or with prehnite/datolite (New Jersey).
  • Composition and balance matter—avoid overcrowded, jumbled clusters unless the arrangement is naturally dynamic and undamaged.

• Size and Aesthetics:

  • Single, perfect crystals make elegant thumbnails or miniatures.
  • Large, sparkling plates with intact tips and an eye-catching arrangement are outstanding cabinet pieces.
  • Ensure the piece displays well from at least one primary angle and shows color/clarity in normal lighting.

• Condition:

  • Apophyllite has perfect basal cleavage and is brittle; tips and edges chip easily.
  • Prioritize specimens with intact main terminations and minimal nicks.
  • Small contacts on the back or base are acceptable; visible front-face damage significantly lowers desirability.

Detecting Repairs or Treatments

• Repairs:

  • Because of easy cleavage, many apophyllites are repaired. Inspect for straight, planar seams, slight misalignments, or glossy glue lines at crystal junctions and where crystals meet matrix.
  • A 10x loupe and longwave UV may reveal epoxy fluorescence along join lines.
  • Quality matrix reattachments are common and acceptable on important pieces if disclosed.

• Polishing or Restoration:

  • Polished terminations are unusual but possible. A suspiciously mirror-flat, overly perfect tip lacking natural growth textures could indicate polishing.
  • Some minor edge smoothing may occur; disclosure is preferred.

• Treatments:

  • Dyeing is not typical for apophyllite; heating is risky and rarely done for specimens.
  • Assume natural color unless something appears unnatural; provenance helps.

Care and Storage

• Handling:

  • Support specimens with both hands; avoid pressure on crystal tips and edges.
  • Apophyllite has perfect basal cleavage and can flake if stressed—handle over a padded surface.

• Cleaning:

  • Dust gently with a soft brush or use gentle rinse in lukewarm water with a drop of mild dish soap; avoid ultrasonic or steam cleaners.
  • Rinse thoroughly and air dry. Be cautious with delicate associates like okenite or fragile scolecite sprays—use only dry dusting on those.
  • Avoid acids and harsh chemicals which may damage matrix or associated zeolites.

• Light and Temperature:

  • Colors are generally stable in normal indoor lighting; avoid prolonged direct sunlight and high heat.
  • Apophyllite dehydrates upon heating and may turn cloudy; never bake, boil, or expose to temperature shocks.

• Environment and Storage:

  • Store in individual padded boxes or on stable stands with a small amount of mineral tack.
  • Keep away from vibration and overcrowded shelves to prevent knocks.
  • Label thoroughly—locality and provenance matter, especially for classic New Jersey and top Indian pieces.

By selecting sharp, lustrous crystals with strong color (when present), pristine terminations, and attractive associations, you can curate apophyllite specimens that deliver maximum sparkle and appeal—from jewel-like singles to dramatic, museum-worthy plates.