Overview

Dravite is the sodium–magnesium member of the tourmaline group, typically forming sharp, striated trigonal prisms with flat pinacoidal or steep pyramidal terminations. Its classic colors range from warm honey-yellow and root-beer brown to deep forest green when chromium and/or vanadium are present (often termed chrome-dravite). In metamorphic marbles and calc-silicate rocks, dravite frequently grows with diopside, tremolite, calcite/dolomite, graphite, and tsavorite garnet, making for striking white–green or white–brown contrasts on matrix.

For collectors, dravite offers textbook tourmaline form and a spectrum of earthy to vivid hues at generally approachable prices compared to elite elbaite varieties. However, the best pieces—especially saturated chrome-green single crystals or pristine matrix specimens on bright marble—are scarce and command strong premiums. Well-formed crystals commonly show glossy luster, triangular cross sections, and beautiful internal “whiskey” glow in brown varieties or vivid bottle-green in Cr/V-rich pieces.

Popularity

Dravite has long taken a back seat to the more gem-trade-driven elbaite, yet it remains a connoisseur’s favorite for classic crystallography and locality specificity. Its warm browns appeal to those who appreciate subtle, natural tones, while chrome-dravite from East Africa provides dramatic, saturated greens with world-class luster and form. Key discoveries—such as Landanai chrome-dravite in Tanzania and marble-hosted clusters from Namibia and Madagascar—have cemented dravite as a serious collector’s species. Today it occupies a sweet spot: abundant enough for newcomers to find handsome examples, but with a top tier (especially green Cr/V-rich crystals on matrix) that is decidedly rare and competitive.

Top Collecting Localities

Landanai, Tanzania

Landanai, in Tanzania’s Longido area, is the reference source for world-class chrome-dravite. These crystals, colored by chromium and vanadium, range from hot bottle-green to deep forest green with glassy luster and razor-sharp terminations. Most occur as stout prismatic singles from 2–8 cm, with occasional matrix pieces on marble or magnesite. Associations can include tremolite, diopside, and calcite; when present, snowy white matrix makes the green crystals “pop.” Pockets have been sporadic, and many crystals were recovered as loose singles—true, undamaged, on-matrix specimens are therefore much rarer and more valuable. Classic Landanai pieces display bright, reflective prism faces, strong color even without backlighting, and crisp triangular cross sections that define tourmaline’s trigonal symmetry.

Merelani Hills, Tanzania

Better known for tanzanite and tsavorite, Merelani has also produced attractive dravites—typically honey-yellow to cognac-brown prisms in calcite/graphite-rich marbles. Crystals are often gemmy toward the tips, with bright luster and excellent form in the 1–5 cm range. Associations with diopside, tremolite, calcite, and graphite are common, and occasional greenish dravite occurs. Many pieces were recovered as singles during tanzanite mining, so fine matrix specimens are less frequent. Merelani dravite is prized for its “whiskey” glow and textbook form, offering an aesthetic contrast to the area’s blue-violet zoisites and green garnets.

Collector’s Guide

Evaluating Specimen Quality

• Color:

  • Brown dravite: Look for saturated, warm hues (honey, cognac, root-beer). The finest display richness without looking overly dark in normal light.
  • Chrome-dravite (Cr/V-bearing): Vivid, saturated greens are most prized. Top Landanai crystals show strong green even in ambient light, not just when backlit.
  • Avoid overly dark, “inked-out” tones that lose internal glow on the shelf.

• Clarity and Luster:

  • Dravite can range from translucent to gemmy. Even modest clarity works if the luster is high and the color is rich.
  • Seek sharply reflective prism faces and crisp terminations. A bright, glassy luster significantly elevates the piece.
  • Backlighting should reveal an attractive internal glow for both brown and green crystals; cloudy cores or extensive cracks reduce impact.

• Crystal Form:

  • Classic tourmaline prisms with strong vertical striations and either flat pinacoids or steep multi-faceted terminations.
  • Symmetry and completeness are key; undamaged tips matter greatly.
  • Clusters should show balance—ideally a dominant crystal with supporting smaller prisms, not a jumble.

• Matrix and Associations:

  • White marble or calcite/dolomite matrix provides excellent contrast for both brown and green dravites (Otjua, Landanai, Merelani).
  • Attractive companions include diopside, tremolite, tsavorite, quartz, and mica.
  • True, unrepaired matrix pieces are much rarer at many localities and thus carry a premium.

• Condition:

  • Examine terminations and edges carefully; tiny nicks are common and impact value.
  • Repairs (reattaching crystals or tips) are common in tourmaline—acceptable if clean and disclosed, but unrepaired specimens are preferred.
  • Avoid polished “fake” terminations; natural tips often have subtle growth features rather than mirror-flat, flawless planes.

• Size vs. Aesthetics:

  • A smaller, perfectly formed, high-luster crystal with rich color often outshines a larger but dull or damaged piece.
  • For green chrome-dravite, intensity of color and luster outweigh sheer size for most collectors.

Detecting Repairs or Treatments

• Repairs:

  • Check for straight glue lines, slight misalignments in striations, or glossy seams—especially where a crystal meets marble or along a suspected break.
  • Use a 10x loupe; some epoxies fluoresce under longwave UV.
  • Multiple repairs diminish desirability; one clean, disclosed repair may be acceptable on an otherwise outstanding specimen.

• Treatments:

  • Dravite is rarely heat- or irradiation-treated as a matrix specimen. Most color enhancements occur in the gem market, not in collectible crystals.
  • Be cautious of overly perfect, mirror-flat terminations—these may be polished; natural pinacoids usually show faint growth textures.

Care and Storage

• Handling:

  • Tourmaline is hard but brittle. Support matrix pieces from below and avoid pressure on slender crystals or tips.
  • Use soft padding during transport; vibration can propagate existing internal stress fractures.

• Cleaning:

  • Dust gently with a soft brush. For grime, use lukewarm water with a drop of mild dish soap and a soft brush.
  • Critical: Many dravite specimens sit on calcite/dolomite marble. Do not use acids (including vinegar) or strong chelators that can etch or dissolve carbonate matrix.
  • Avoid ultrasonics and steam; both can induce cracks or compromise old repairs.

• Light and Temperature:

  • Natural dravite color is generally stable. Normal display lighting (LED preferred) is fine.
  • Avoid prolonged direct sun or heat sources to minimize risk of thermal shock or adhesive failure on repaired pieces.

• Storage:

  • Pad and separate specimens to prevent scratching. Keep heavier/harder pieces away from delicate tourmaline terminations.
  • In seismic or vibration-prone areas, secure displays with a small amount of museum putty (keeping it off sensitive marble surfaces when possible).

With thoughtful selection and care—favoring luster, color, sharp terminations, and clean aesthetics—dravite can anchor a tourmaline suite, from subtle whiskey-browns to the electric greens of chrome-dravite masterpieces.