Molybdenite Collectors Guide

Detecting Repairs or Treatments

• Reattachments and Stabilization:

  • Plates or rosettes sometimes detach and are re-glued. Examine junctions and plate bases under magnification for hairline adhesive films, slight misalignments, or glue sheen. Some epoxies fluoresce under longwave UV.
  • In fragile clusters, preparators may use consolidants (e.g., Paraloid) to reduce shedding. Over-application can leave a slightly plasticky gloss not typical of natural lamellae.

• Cleaning Artifacts:

  • Abrasive cleaning leaves micro-scratches and dulled luster; rubbed edges appear matte or “feathered.”
  • Strong oxidizers (e.g., hydrogen peroxide) can alter surfaces and encourage yellowish molybdite alteration on edges—avoid.

• Polishing/Coating:

  • True polishing of molybdenite plates is rare (and risky) but would leave an unnaturally uniform mirror surface and softened micro-texture. Any coating that changes the feel or reflectivity should be disclosed.

In general, minor, well-executed reattachments on significant pieces can be acceptable if disclosed; heavy stabilization or assembled composites are less desirable.

Care and Storage

Molybdenite demands gentle, thoughtful care due to its softness and perfect cleavage.

• Handling:

  • Support the matrix; avoid touching plates. Even a soft brush can abrade surfaces.
  • Do not flex or press plates—delamination is easy and irreversible.
  • For transport, immobilize the specimen in foam so no vibration can make plates rub.

• Cleaning:

  • Prefer air bulbs or very gentle puffs of clean air; avoid compressed air at close range (it can lift flakes).
  • If absolutely necessary, rinse lightly with distilled water and let dry—no rubbing. Avoid detergents, ultrasonic cleaners, steam, acids, or oxidizers.
  • Never use solvents or aggressive chemicals; they can undercut any adhesives and encourage alteration to yellow molybdite on edges.

• Environment:

  • Room temperature and normal humidity are fine. Keep away from vibration, friction, and stacking where plates could scrape.
  • Avoid prolonged exposure to corrosive or acidic fumes (e.g., near lab acids) which may lead to surface alteration over time.
  • Light does not typically affect color, but place out of direct sun to minimize heating and dusting frequency.

• Storage and Display:

  • Covered cases or dustproof boxes protect the delicate surfaces.
  • Isolate from harder or abrasive specimens; a tiny nudge from quartz or feldspar can scratch plates.
  • If a specimen has known stabilization (e.g., consolidant), avoid heat or solvents that might compromise it.

Treat molybdenite like you would a fine graphite drawing: protect from touch, abrasion, and harsh cleaning. With careful handling and soft, dust-free storage, the metallic luster and sharp geometry will endure for decades.