How Precise Should an Obsidian Locality Be on a Label

A useful obsidian label has two jobs: it should help you recognize the specimen, and it should avoid overstating the locality.

For a small display label, the clearest format is usually a simple hierarchy:

A “supported place” is the finest locality level tied to the specimen by a label, field note, acquisition record, catalog entry, or other documentation. It is not simply the most detailed name you can find online.

That distinction matters because obsidian is often sold with attractive locality language. Some names may refer to real collecting areas, volcanic fields, regional sources, or trade shorthand. Still, a market name should be recorded as a claim unless the specimen’s documentation supports more.

A small label cannot carry every useful detail. The display label should be clear enough to identify the piece in a tray, cabinet, or inventory. The fuller collection record can hold the information that protects the label’s meaning later.

For an obsidian specimen, the record may include:

This split prevents two problems. First, the visible label stays readable. Second, uncertainty does not disappear. A display tag that says “Obsidian — Nevada” may be enough for viewing, but a record that preserves “old label reads ‘Nevada obsidian, purchased 1990s, no exact source’” is much more useful later.

Collection-data standards often separate locality text, coordinates, and coordinate uncertainty. That idea is helpful even for a simple private collection. A place name is not the same as a map point, and a coordinate is not the same as proof.

Collectors often feel pressure to make labels more specific. A country, state, or region can look unfinished beside a label with a named mountain, county, quarry, flow, or GPS point. But a broad locality label is sometimes the most accurate choice.

Use broad wording when the finer source is unknown, unsupported, or only implied. “Mexico,” “western United States,” “Oregon,” or “Armenia” may feel incomplete, but those labels are honest if that is all the specimen’s documentation supports.

Broad wording is especially appropriate when:

Appearance can help you describe a specimen, compare varieties, and decide what questions to ask. Color, sheen, inclusions, polish style, and fracture can support identification work. They usually cannot turn a broad locality into a documented site.

False precision happens when a label looks more exact than the evidence behind it. It often starts with small upgrades.

A seller tag says “Oregon,” and the later record becomes “Glass Buttes.” A collecting area becomes a named pit. A named locality becomes a coordinate copied from a map. A coordinate gains several decimal places even though the original information was only regional. Each step may look more complete, but it can make the specimen less accurately labeled.

Coordinates deserve particular care. Decimal coordinates look authoritative because they point to a precise spot on a map. But a coordinate may be recorded at the collecting spot, estimated from a place name, copied from an online locality page, or assigned to the center of a broader area. Without an uncertainty note, the number may imply more confidence than the record deserves.

The right level depends on the evidence and on how the label will be used.

These are example wordings, not documented field cases. Their purpose is to show how the same locality information can be handled differently on a display label, a private record, or a transfer note.

A mineral locality hierarchy can move from broad geography to narrower place names: country, state or province, county or district, volcanic field, named locality, flow, pit, roadcut, or collecting site. Not every specimen earns every level. If the record stops at “state,” stop there. If it stops at “area,” do not add a pit. If the original tag gives only a trade name, record it as a claim rather than expanding it into a full locality history.

A locality label records where a specimen is said to be from. It does not tell you whether collecting is currently allowed there, whether the land is public or private, whether a road is open, or whether a site is appropriate to enter.

Older labels need special caution. A past collector’s tag may name a place that is now restricted, privately owned, protected, closed, or difficult to reach. In U.S. public-land contexts, agencies publish separate rockhounding rules and site restrictions. In other countries or land categories, the same principle applies: locality information is not permission.

Useful access notes should be factual and modest:

For an obsidian collector, the goal is not to make every label sound like a database entry. The goal is obsidian label clarity: a readable tag that says what is known, and a fuller record that preserves how it is known.

Use a specific obsidian locality when the documentation supports it. Use a broad locality label when broader is all you have. Keep the original locality wording, the source of the claim, and any provenance uncertainty where you can find them again. Treat coordinates as useful record details, not automatic proof. A label that honestly says less is better than one that looks exact but rests on guesswork.