How do you photograph specimens so buyers trust the listing?

Shoot every specimen the same way: on a tripod, with the camera's timer, under steady light with the flash off, against a plain background, with a scale in at least one frame and the color checked against something neutral. Show every side, and close-ups of any damage or repair. Mindat's advice to people selling a collection puts the reason bluntly: "Without measurements and good photos, it is impossible to judge the value of a specimen" [1]. A photo is also part of what you claim about the piece, so it must not hide damage or flatter color [2]. This page sets up a photo station and covers light, scale, color, damage, small and fluorescent pieces.

Why honest photos matter beyond sales

The FTC judges an advertisement by its "net impression," taking in "the text, product name, and any charts, graphs, and other images" [2]. That sentence comes from the FTC's health products guidance, but the principle runs through its approach to all advertising: a photo edited to remove a chip, or lit to turn pale amethyst deep purple, misdescribes the piece as surely as a false word would. Buyers also compare. A specimen that arrives looking different from its photos comes back, and the buyer does not return.

Setting up a photo station

1. A stable support. A tripod, or a phone clamp on a stand. Mindat's routine is a tripod, the timer, good lighting and the flash off [1]; the timer stops the press of the shutter from shaking the frame.
2. Light from two sides. Two lamps of the same type, one on each side and slightly in front, or one lamp and a white card bouncing light into the shadows. Diffuse them with paper or a light tent so crystal faces show without hard glare. Daylight from a window works too, but changes through the day.
3. A plain background. Matte black shows pale and bright minerals; light gray or white suits dark ones. Avoid patterned cloth.
4. A scale. A small ruler or scale bar in centimeters, placed beside the specimen in at least one photo.
5. A neutral reference. A gray or white card in the first frame of each session lets you correct color.
6. The same setup every time. Mark the positions of the lamps and the camera so every listing looks consistent.

Phone or camera

A recent phone is enough for most specimens above thumbnail size if it is held still and the light is good. A camera with a macro lens does better for thumbnails, micro crystals and fine detail. The deciding test is simple: zoom in on your photo and check whether crystal edges are sharp. If they are not, the problem is more often light and support than the camera.

Preparing the specimen

• Dust it. Mindat recommends a soft brush, with a warning: "Do not use this on fine needle specimens, as you will break the crystals" [1]. Friable and delicate pieces should not be brushed at all; NPS guidance says "Friable specimens should never be dusted" [3].
• Keep the label in the box, and photograph it separately; buyers want to see an old label.
• Handle hazardous species with gloves. NPS recommends latex or nitrile gloves for radioactive specimens [4] and neoprene gloves for toxic-element minerals [5]. Wash your hands after a session.
• Limit light on light-sensitive species. NPS keeps light-sensitive specimens "in closed cabinets" [3]. Photograph them quickly and put them away. Which species fade is on light fading.

The shot list

Write the dimensions in the listing too, measured in centimeters in three directions [1]; a scale in a photo is not a substitute for the number. The size classes buyers search by are on size classes.

Getting color right

Color is the hardest thing to get right in a mineral photo. Correct the white balance from the gray card in the first frame, then compare the image on your screen with the specimen beside it under daylight. Adjust only toward what you see. Do not raise saturation to make a color "pop," and do not shift hue. If a piece looks different under warm and cool light (some do), say so in the description and show both.

Showing damage honestly

Photograph damage at the same scale as the rest of the specimen, then close up. Never retouch a chip, crack, glue line or filled area out of a photo, and never crop it out of every frame. If a repair is invisible in the photos, describe it in the listing and say it does not show.

Small pieces: thumbnails and micros

• Use a macro lens or a phone's close-focus mode, and keep the camera parallel to the main crystal face.
• Stop down (a smaller aperture) for more depth of field, or take several frames at different focus distances and stack them with software. State in the listing that the image is focus-stacked.
• Put the scale bar in the same plane as the crystal.
• For a specimen in a perky box, photograph it out of the box, then in the box as it will arrive.

Fluorescent pieces

Buyers of fluorescent minerals want a daylight photo and a UV photo, each labeled with the band (longwave, midwave or shortwave). Shoot in a dark room with the camera on the tripod and a longer exposure, and do not add visible light. Cameras exaggerate some fluorescent colors, so compare with your eye and adjust down, not up.

UV lamps are a hazard to eyes and skin. Lamp safety instructions warn that "Exposure to shortwave, midwave, or longwave UV light can cause skin and eye injury" and that "UV-blocking eye protection should be worn" [6]. Wear UV-rated glasses, keep skin covered and never point the lamp at anyone [6][7]. The bands and lamp safety in full are on fluorescent minerals and UV lamps.

From the photo station to the listing

Name your files with the stock number so photos, record and specimen stay linked. The rest of the listing, what it must contain and what platforms forbid, is on selling online.

References

1. Bri Dragonne, *Advice for people selling and sorting a mineral collection*, Mindat.org article 836, last updated November 19, 2009. https://www.mindat.org/article.php/836/Advice+for+people+selling+and+sorting+a+mineral+collection.
2. Federal Trade Commission, *Health Products Compliance Guidance*, PDF carries no date (announced December 20, 2022, per Covington & Burling, Inside Privacy, January 9, 2023), read October 22, 2026. https://ftc.gov/system/files/ftc_gov/pdf/Health-Products-Compliance-Guidance.pdf
3. National Park Service, Kathy Hall, *Storage Concerns for Geological Collections*, Conserve O Gram 11/2, April 1998. https://www.nps.gov/subjects/museums/upload/11-02_508.pdf
4. National Park Service, Greg McDonald, *Radioactive Minerals*, Conserve O Gram 11/10, September 2006. https://nps.gov/subjects/museums/upload/11-10_508.pdf
5. National Park Service, Greg McDonald, *Health and Safety Issues with Geological Specimens*, Conserve O Gram 11/11, September 2006. https://www.nps.gov/subjects/museums/upload/11-11_508.pdf
6. Geology.com, "The Excella 3-in-1 UV Flashlight: Shortwave, Midwave, Longwave in One," product page safety instructions (undated, read October 2026). https://geology.com/store/fluorescent-minerals/uv-lamp.shtml
7. Steve Sorrell, "The Wonderful Glowing World of Fluorescent Minerals," Mineral Matters #592, January 31, 2025. https://mineralmatters.substack.com/p/the-wonderful-glowing-world-of-fluorescent