Totally new to collecting? Start here
There's no entry exam for this hobby. Collectors arrive by all sorts of routes — a rock picked up on a childhood walk, a museum case that wouldn't let go of your attention, a gift that turned into a habit. This page is a short, plain-English orientation: the handful of terms you'll see repeated on every specimen page, how to handle and look after what you buy, and where to go next once you want more depth.
A few terms you'll see everywhere
- Locality
- Where the specimen was found — ideally down to the specific mine or quarry, not just the state or country. A precise locality is what lets a specimen be studied, compared, or collected systematically; "Australia" alone tells you very little, "Kintore Open Cut, Broken Hill, New South Wales" tells you a great deal.
- Matrix
- The host rock a crystal or mineral grew on or within. A specimen "on matrix" keeps that natural attachment; a loose crystal with no matrix is sometimes called a "floater."
- Associated mineral(s)
- A second (or third) species present on the same specimen alongside the main one — for example "Pyromorphite with Malachite." These aren't contamination or a flaw; naturally co-occurring minerals are often part of what makes a piece interesting.
- Provenance
- A specimen's documented ownership history — a named collector or an earlier dealer it passed through. Provenance is evidence of where a piece has been, not a claim about the mineral itself; a specimen with no recorded provenance is not a lesser specimen, just one with a shorter paper trail.
- Vug / pocket
- A natural cavity in rock where crystals had room to grow freely, often producing better-formed faces than crystals that grew under pressure from surrounding rock.
- Habit
- The characteristic shape a mineral tends to grow in — prismatic, botryoidal (grape-like rounded clusters), acicular (fine needles), massive (no obvious crystal form), and so on. The same species can show different habits depending on how and where it formed.
- Size class
- A rough browsing category — Thumbnail, Miniature, Small Cabinet, Cabinet, Large Cabinet — worked out from a specimen's longest dimension. It's a convenience, not a quality grade: plenty of serious collectors work almost entirely in Thumbnail or Miniature sizes.
- Hardness (Mohs scale)
- A simple 1–10 scratch-resistance scale (Talc is 1, Diamond is 10) used to describe how easily a mineral's surface can be scratched. It's a rough practical guide to how carefully a specimen needs to be handled and displayed, not a measure of quality or value.
For the full structure of a listing — identity, locality, dimensions, condition, price and photos, in the order we present them — see How to read an EarthStones specimen page.
Looking after what you buy
Minerals are durable in one sense and surprisingly not in another — most will outlast you if treated sensibly, but a few common mistakes cause real, often irreversible damage.
Handle by the matrix, not the crystals
Where a specimen has a solid base of host rock, pick it up by that base. Crystal points and delicate growths — needles, sprays, thin blades — are the parts most likely to snap, and they don't reattach invisibly.
Keep light-sensitive species out of direct sun
A handful of minerals genuinely fade or darken with prolonged light exposure — Proustite and Pyrargyrite ("ruby silvers") are well-known examples, and some Fluorite and Realgar can shift too. If a specimen's description mentions light sensitivity, treat it as a real instruction, not a formality: a stable, indirect-light position protects colour that won't come back once lost.
Watch humidity for water-soluble and reactive species
Most minerals are unaffected by normal household humidity, but a few are genuinely sensitive — some sulphides can develop a surface bloom in damp conditions, and a small number of minerals are soft enough that handling with damp or oily hands leaves lasting marks. When in doubt, dry, stable, out-of-the-way is always the safer default.
Dust gently, or not at all
A soft, dry brush is usually enough. Avoid water, cloths or cleaning products on anything you're not certain about — plenty of specimens have been damaged by well-meaning cleaning, far more than by being left alone.
Starting a collection without overthinking it
You don't need a plan, a budget spreadsheet, or a theme before buying your first specimen — plenty of serious collections started with one piece bought on instinct. If you'd like a bit of a steer anyway: picking a focus eventually (a locality, a species, a size class, an era) tends to make a collection more satisfying over time than acquiring at random, but it's something that usually becomes clear after a few purchases, not before. For more on this, see The specimen that started it and It is your collection.