Quartz is one of the most photographed minerals in any collection, and one of the most awkward to photograph well. A crystal that looks crisp and deep on the shelf can come back from the camera as a flat, blown-out shape with the reflection of your lens printed across its main face. The cure is not expensive equipment. It is control of three things: the light, the focus and the scale.
Why a Record Shot Beats a Pretty One
A photograph is a specimen's memory. If a crystal is sold, swapped or boxed away for five years, the picture is what identifies it afterwards. So shoot for the record first and for beauty second.
A good record shot answers predictable questions: what is it, where is it from, how big is it, and what does the termination actually look like? It is repeatable, consistent and quick — a few minutes per specimen once the bench is set up. The dramatic shot can come later, when the catalogue is up to date.
Set Up a Bench You Can Leave Standing
The biggest improvement to most people's specimen photography is refusing to dismantle the setup after every session. A small desk, a tripod that stays roughly in place, two lamps and a stack of backgrounds will do. Use black velvet or matte card for pale and milky quartz, and white or mid-grey card for smoky, amethyst and citrine, where a black background swallows the darker tones.
Lift the specimen off the surface on a small riser or a block of glass so it does not sit in its own shadow, and keep the background well behind it. Set white balance manually and leave it alone. High-colour-rendering daylight LEDs are worth the modest extra cost: amethyst lit by a cheap cool-white bulb turns an odd violet-blue, and colour records you cannot compare are not much use.
Lighting Quartz So the Faces Read
Quartz is transparent to translucent, which means light passes through it, bounces around inside and emerges somewhere you did not plan. Direct flash is the enemy: a hard white hotspot on the brightest face and a black void everywhere else. Diffuse first, then add direction.
Start with diffusion
Put tracing paper, a white plastic bag or a proper diffusion panel between each lamp and the specimen. Two lights at roughly 45 degrees either side is a sound starting point; move one closer or further away to control the balance.
Add a low, raking light for striations
The prism faces of quartz carry fine horizontal striations, and they are among the most useful features in a record photograph — they help separate quartz from similar-looking minerals and show growth direction. They vanish under flat frontal light. Bring one lamp down almost level with the face and sweep it in small increments until the lines appear as fine ridges. A few degrees of movement makes a large difference.
Use backlight for what is inside
Phantoms, smoky zoning, rutile needles and fluid inclusions all live inside the crystal and only appear when light comes from behind. Stand the specimen on a sheet of glass with a small LED panel underneath and a black card behind, then expose for the internal detail rather than the surface. You lose the outer form, which is why this is an extra shot rather than your main one.
Reflections are the last nuisance. A glossy prism face behaves like a mirror and shows your lens, your hands and the room. Angle the crystal a few degrees off the camera axis, or cut a hole in a piece of black card and shoot through it. A circular polarising filter calms glare, but use it sparingly: it also flattens the internal colour of some specimens.
Focus Stacking: Getting the Whole Crystal Sharp
At close range, depth of field collapses. Photograph a 40 mm crystal at f/11 and you might get only a few millimetres genuinely sharp. Stop down to f/22 to compensate and diffraction softens everything, so the answer is to stack several frames instead.
- Lock the camera on a tripod. Switch to manual focus, manual exposure and a fixed white balance, and use the lowest native ISO.
- Set the aperture to f/8 or f/11 — the sweet spot for most macro lenses.
- Use a two-second timer or a remote release. Touching the camera between frames ruins the stack.
- Focus on the nearest point of the specimen, then advance the focus in small steps towards the back, checking progress in magnified live view.
- Take 10 to 30 frames to cover the depth, plus a couple of spares at the rear.
- Stack them in software, then retouch by hand wherever transparent faces have produced halos.
If your camera or phone offers in-camera stacking, it will handle a single crystal well enough. Clusters with overlapping points are where manual stacking and careful retouching earn their keep.
Scale Bars, Labels and Consistency
A photograph without scale is an ornament. Use a printed scale bar with millimetre markings, laid beside the specimen in the same plane of focus. Skip the coin: sizes differ between issues and countries, and in twenty years nobody will remember which one you used. A laminated card carrying your catalogue number, locality and the date of the photograph costs nothing and saves endless guesswork.
The scale bar must sit in the same plane as the specimen. If it lies a centimetre closer to the lens or further away, it is telling you a lie about size. Remember that with a 30 mm crystal, a few millimetres of error is a ten per cent error.
Keep everything else constant too: same lens, same distance, same background, same lights. Only then can you compare an amethyst from Brazil with one from Scotland and trust what you see. Include a grey card in the first frame of each session so you can correct colour later if needed.
A Short Checklist Before You Shoot
- Specimen cleaned — dust and fingerprints show at close range.
- Background chosen to contrast with the crystal's tone.
- Lights diffused, with one set low for striations.
- Tripod locked, timer on, manual exposure.
- Scale bar and label card in frame, in the same plane.
- Four standard views: front, side, back and top of the termination.
- Then, if time allows, one backlit shot and one beauty shot.
Make It Routine
Ten minutes per specimen, done once, saves an hour of guesswork later. Settle on a standard — same bench, same bar, same four views, file names that follow your catalogue numbers — and photograph each new specimen the week it arrives, while you still remember where it came from.
Waiting for the perfect setup means you end up with nothing. A slightly imperfect photo taken today will identify your crystal in ten years' time; the perfect one you never got round to taking will not.
