“I inherited a mineral collection” — what to do first
Do nothing irreversible for 30 days. Photograph every specimen with its label, keep labels with their stones, and check for four hazard groups before sorting.
Do nothing irreversible for 30 days. In the first 24 hours, photograph each mineral specimen beside its own label and keep the two together, because the locality on that label is a large part of what a collection is worth. Then check for four hazard groups before handling anything further.
In short
- The single most destructive thing you can do is separate a specimen from its label, and it is also the easiest. Provenance is a large part of what makes a collection worth more than a box of rocks, and once a label is orphaned it cannot be reunited.
- There is almost certainly no deadline. Minerals do not perish on a schedule. Unless the house is being cleared this week or the collection is somewhere damp, you have months. Anyone telling you to decide quickly is telling you something about themselves.
- Check for four hazard groups before you sort. The Natural Sciences Collections Association names radioactive minerals, asbestiform minerals, arsenic and antimony minerals and mercury as the categories needing specific handling. This is the one step that genuinely comes first.
- Most collections contain a few good pieces and a long tail. That is the normal shape and it is not a disappointment. The work is identifying which is which, and that is done by a specialist looking at the actual specimens, not from a photograph of a drawer.
- We are frequently not the answer. If the collection is of local or scientific importance, a museum is the right destination. If it is bound up in probate, the executor decides, not you. If it contains radioactive material, a Radiation Protection Adviser comes before a dealer.
| Window | Do this | Do not do this |
|---|---|---|
| First 24 hours | Leave everything where it is. Photograph each specimen with its label in the same frame. Photograph the drawers and cabinets as found, before anything moves | Do not tip drawers out, do not put specimens in one box together, do not throw away any paper |
| First 7 days | Check for the four hazard groups. Move anything damp somewhere dry. Find and keep every notebook, catalogue, index card and old letter | Do not wash anything. Do not attempt to clean or improve a specimen. Do not sell the pieces that look best |
| First 30 days | Get an opinion on the collection as a whole from someone who handles this material. Ask the local museum whether any of it is of regional importance | Do not split the collection before it has been looked at. Do not accept a single offer for the good pieces only |
| After 30 days | Decide: keep, donate, sell as a whole, or sell in parts. All four are legitimate outcomes | Do not let the decision be made by whoever arrived first |
| If the house must be cleared sooner | Photograph, box carefully with labels attached, and move it. Storage is cheap and reversible | Do not let a house clearance firm take it as general contents |
Why the labels matter more than the minerals
This is the part that surprises people, so it is worth putting first. A mineral specimen with a full history — the mine, the level, the date, the collectors who owned it in between — is a documented object. The same stone with no paperwork is decorative material. The difference between those two things is large, and it is entirely destroyed by the reasonable-looking act of putting all the specimens in a box and all the little cards in an envelope.
Old labels also carry information that no longer exists anywhere else. A mine that closed in 1901 has no records; the label written by the collector who was there is the record. That is why museums accession labels alongside specimens and why an ex coll. attribution to a known collector adds weight — see our page on what the abbreviations on a mineral label mean.
The rule, and it is the only rule on this page that has no exceptions: a label never travels separately from its specimen. If a specimen has several labels from successive owners, keep all of them, in order. If a label has fallen off, photograph it in the drawer position where you found it before you move either.
If the specimens are in a cabinet with numbered drawers and there is a catalogue somewhere, the catalogue is the most valuable single object in the house. Find it before you find anything else.
The hazard check, and how to do it without a specialist
Mineral collections assembled over decades routinely contain material that would not be handled casually today, and the Natural Sciences Collections Association's guidance for museum collections names the groups explicitly. You are not being asked to identify minerals — you are being asked to spot four situations and stop.
Radioactive minerals. Guidance for institutions is that a collection should be checked with a Geiger counter, and that if radioactive specimens are present a Radiation Protection Adviser should be contacted. Look for the words uraninite, pitchblende, torbernite, autunite, carnotite, thorite or monazite on labels, and for bright yellow or green secondary crusts. Handle with gloves and a dust mask, minimise the time you spend holding them, and wash your hands. Our page on whether a mineral is radioactive goes into the detail.
Asbestiform minerals. Anything fibrous — fine, hair-like, silky fibres that can be teased apart. Do not handle, do not repack, do not vacuum near it. Local councils employ asbestos officers.
Arsenic and antimony minerals, and soluble lead minerals. Very common in British collections because the classic Cornish and Cumbrian localities are arsenate localities. Gloves, no dust, no eating nearby, wash afterwards. Worth knowing: galena is not toxic in the same way, because it is insoluble.
Mercury. Rare but serious. Native mercury seeps and gives off vapour; keep it lidded and open only in ventilated conditions.
Our page on toxic minerals in a collection covers the practical handling. None of this is a reason to panic about a collection that has sat in a spare room for forty years — it is a reason to wear gloves and not to sand anything.
When it is urgent, and when it is not
Almost never urgent. Minerals are geologically old and are not going to deteriorate over the few weeks it takes to think. Three situations genuinely do have a clock on them, and it is worth knowing which.
A damp environment is urgent. A garage, a cellar or an unheated outbuilding above 60% relative humidity will actively damage sulphides — above that figure pyrite reacts with atmospheric water to form iron sulphates and a weak sulphuric acid, and the acid then attacks the labels. Above 65%, mould grows. Moving boxes into a heated part of the house is a same-day job and it is free. See why pyrite crumbles.
A house clearance is urgent, because clearance firms price contents by volume and a mineral collection looks like heavy rubbish. If a date is fixed, box the collection with labels attached and move it to storage. That decision is cheap, quick and completely reversible, which is exactly what you want when you cannot yet make the real decision.
Probate can impose a real deadline, but the deadline is administrative, not physical, and it belongs to the executor. If you are not the executor, the disposal decision is not yours to make. If the estate needs a value, that is a valuation question rather than a sale question — see is my rock worth anything for what actually drives value.
Everything else — deciding whether to keep it, learning what is in it, choosing a destination — benefits from taking longer, and gets worse when rushed.
Your four real options, and who each one suits
Keep it. Underrated. A collection that stays together in a dry room costs nothing to own and can be understood slowly. If any part of you wants to, do this and revisit in a year. Read handling and storage and stop there.
Donate or offer it to a museum. The right answer when material has regional or scientific importance: local suites, mines that no longer exist, type-locality material, or anything with a documented nineteenth-century history. Approach the county or university museum with your photographs and your catalogue. Be prepared for a museum to decline or to want only part — they are constrained by storage and by collecting policy, and a refusal is not a verdict on quality.
Sell it as a whole. Simplest, fastest, and it keeps the collection and its documentation together. It will realise less per specimen than a piece-by-piece sale, and that discount is real and worth understanding rather than resenting: whoever buys it takes on the sorting, the storage and the risk on the long tail.
Sell it in parts. Realises the most on the good material and leaves you holding everything that does not sell. It also takes months and it breaks the collection up permanently. Choose this deliberately, not by default because someone offered to take “just the nice ones”.
What we do here is the second half of that last option, from the other side: we keep a wanted list of what individual collectors are looking for and match specimens to it. That means we are a good fit if a collection contains fine specimens from named classic localities, and a poor fit if it is largely unlabelled or largely decorative material — in which case a general auction house or a mineral show will serve you better. There is no catalogue here and no stock, so a conversation costs nothing and commits nothing. Sending photographs of a few drawers, with the labels legible, is enough for anyone competent to tell you which of the four options above you are actually choosing between.