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How to Mount Mineral Specimens on Bases and Stands

By Digital Towns Crystals ยท Last reviewed October 8, 2026

Short answer: mount a mineral so that it is held, not fixed. For small pieces under about a kilogram, a pea of conservation wax on a clean base stops sliding and comes off later. Larger or awkward specimens want a fitted stand of acrylic, brass or steel, padded wherever metal meets crystal. Glue, hot glue, tape and drilling are last resorts that change the specimen. Every mount should be removable without stress and should never press on a crystal face.

What does a good specimen mount have to do?

Museum mountmakers have a short definition. The AIC's Objects Specialty Group writes that a well-designed mount will provide support to weak areas, distribute weight safely across a brittle or fragile object, and secure loose parts from moving unintentionally (AIC Conservation Wiki, Mounting and Display). The general wiki entry on mounting adds the four tests every home mount should also pass: a successful support is not overly complex, is easily removable, provides as much visual access as possible, and does not apply stress on the object by either insertion or removal (AIC Conservation Wiki, Mounting).

For minerals, three problems drive almost every mounting decision:

  • Sliding. Smooth bases on glass shelves creep with every closing door or passing truck.
  • Tipping. Natural specimens are rarely flat-bottomed, and many are top-heavy.
  • Point loading. A crystal resting on one sharp corner of metal or glass takes the whole weight on a spot a few millimeters wide.

Which mounting method suits which specimen?

Specimen Method Why
Thumbnails and miniatures, flat underside Conservation wax on a small base Stops sliding, removable, invisible
Small piece with an uneven bottom Acrylic riser or block plus wax Gives a level seat without cutting
Hand-sized cluster, top-heavy Fitted acrylic or padded metal cradle Supports the center of gravity
Polished slab or plate Plate stand with padded hooks Holds the edge, not the face
Sphere or egg Ring stand sized to the piece Even contact around a circle
Large cabinet specimen Low, broad base or cut base Weight goes straight down
Specimen in a seismic zone Restraint plus a fitted mount Movement is the main earthquake hazard

Spheres have their own rules (ring size, sunlight and fire risk) in displaying crystal spheres.

How do you use museum wax without marking a specimen?

The Canadian Conservation Institute singles out exactly the case where wax earns its place: lighter objects weighing less than 1 kg on a slippery surface near sources of vibration can benefit from an interleaf or a method of restraint such as wax or an interior restraining block (CCI, Physical Forces). The same guide lists conservation wax among restraint materials long used in the profession.

  1. Clean both surfaces. Dust under wax is what lets a specimen walk.
  2. Use the smallest amount that works. A pea for a thumbnail, three small dabs for a palm-sized piece. More wax does not mean more grip.
  3. Put the wax on the base, not the specimen. Press the specimen down gently with a slight twist; never push on crystal tips.
  4. Keep wax off porous matrix and crystal faces. Wax belongs on a solid, unglamorous patch of the underside.
  5. Remove by twisting, never pulling. A slow rotation shears the wax; a lift can tear off the very crystals it was meant to protect.
  6. Lift residue with more wax. Dabbing a fresh ball of the same wax onto the residue usually picks it up without solvents.

Residue is the real cost of putty used badly. A conservation record from the Thinktank museum in Birmingham notes that paint and putty from previous display use was removed carefully with a scalpel on a sectioned skull (Natural History Conservation), and old labels and glue stains had to be taken off two blocks of sand dollars with acetone. Every one of those treatments started with a quick fix on a shelf.

What should a stand or base be made of?

Professional mountmakers work mainly in four materials. The AIC's mountmaking tools and materials page names brass, steel, aluminum and acrylic as the four standard materials, and gives each a role:

  • Brass is simple to cold-work and can be easily shaped, which makes it the default for small clips and arms, but it is fairly malleable and not suited to structural supports for heavy pieces.
  • Steel has almost twice the rigidity of brass and suits larger, heavier objects, at the cost of needing proper metalworking tools.
  • Aluminum is light for its strength but fatigues and breaks if bent repeatedly.
  • Acrylic is easily cut, shaped and joined with simple tools, but its size-to-strength ratio is poor, so an acrylic mount for a heavy piece ends up thick and visible.

Two rules apply to all of them. First, a barrier always goes between the object and the mount; the AIC lists options from padded polyethylene felt to B-72, and says any material in close contact should be Oddy tested (AIC Conservation Wiki, Oddy Test). Second, metal or other reactive materials are coated and padded where they touch the object. The hardness numbers explain why: on the National Park Service's Mohs chart a steel nail rates 6.5 against 4 for fluorite and 3 for calcite, so an unpadded steel arm will scratch both.

Resin interfaces for uneven bases

For a specimen that will not sit level, museums cast a small resin interface. The AIC describes it as a cast that conforms to a section of the object, provides even support between mount and object and helps avoid point-loading; it also greatly improves the stability of an object with an uneven bottom. At home the same idea works with a removable layer: cling film over the specimen's underside, then a moldable, inert material pressed against it, so nothing bonds to the mineral.

How should heavy and top-heavy specimens be supported?

Find the center of gravity first. Rest the specimen on a padded surface, rotate it gently and note the orientation where it sits without help; that is the attitude the mount should hold, not the most dramatic angle in the dealer's photo. A mount that holds a piece at an unnatural tilt puts constant load on the contact points.

Then think about movement. CCI points out that a substantial portion of earthquake damage results from simple movement rather than the forces of the earthquake itself, and advises immobilizing objects in areas of high seismic risk and ensuring seismic stability in the design of pedestals, hangers and mounts for large objects. In practice:

  • Keep heavy specimens low and on broad bases.
  • Use a fitted cradle or a lip on the base so the piece cannot slide off.
  • Combine a mount with restraint (wax under small pieces, a fitted block behind large ones) rather than relying on friction.

Matrix-heavy pieces are covered in matrix specimens, and cabinet layout in mineral display cases.

Which mounting shortcuts damage specimens?

  • Hot glue and superglue onto a base. Removing them means solvents or a blade on the specimen. If a piece is broken, treat it as a repair; see repairing cracked crystals.
  • Double-sided tape and foam pads. Many contain rubber-based adhesives, which the AIC's exhibit adhesive note says to avoid because of poor aging due to sulfur and chloride content.
  • Drilling for a pin. Permanent, and a stress point in brittle material.
  • Bare metal clips on crystal faces. The fastest way to chip a termination.
  • Wedging into a stand that is too small. A forced fit loads the specimen every day it sits there.

Choosing stands and specimens that mount well

When buying a specimen, look at the underside photo as carefully as the top. A flat, sound, unpolished patch on the bottom makes mounting easy. A piece that only stands on its crystal tips will always need a custom cradle. When buying a stand, check its seat size against the specimen's measured base, look for padded or polished contact points, and prefer a stand that holds the piece by its strongest part.

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Frequently asked questions

What is the best putty for mounting crystals?

A conservation or museum wax sold for securing objects, used in pea-sized amounts on a clean, solid part of the underside. The Canadian Conservation Institute lists wax as a restraint for objects under about 1 kg on slippery surfaces. Avoid putties that leave oily marks on porous rock.

Will museum wax damage a mineral specimen?

Used sparingly on a solid, nonporous patch, it comes off by twisting and dabbing with fresh wax. Problems come from large amounts, porous matrix and pulling the specimen straight up, which can tear crystals loose. Keep it off crystal faces and fragile coatings.

Should crystals be glued to their bases?

No, unless the specimen is already broken and the join is a deliberate, reversible repair. Glue on a base means future solvents or blades on the specimen, and many quick glues age badly. A mount that holds the piece without adhesive is always preferable.

Are acrylic stands safe for minerals?

Yes. Acrylic is one of the four standard mountmaking materials and is easy to cut and shape. It is weaker than metal for its size, so heavy pieces need thick acrylic or a metal mount instead. Pad any sharp acrylic edge that touches a crystal.

How do you mount a specimen that will not stand up?

Find the angle where it rests naturally, then give it an even seat: an acrylic block, a padded cradle or a cast interface that matches the underside. Add a small amount of wax to stop sliding, and never prop it on crystal tips.

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