Collecting
Olemina is a curator of fine mineral specimens. The Journal collects what we’ve learned about provenance, care and the localities that define each species — written to help you buy, keep and live with them.
Calcite Specimens: Crystal Forms, Twinning and Fluorescence
Calcite produces more crystal habits than any other mineral — rhombs, dogtooth scalenohedra, phantoms and Mn-activated fluorescence — but Mohs 3 hardness and perfect cleavage make careful handling…
Quartz Specimens: A Collector’s Guide to the Major Varieties
A collector's guide to quartz specimens: amethyst, citrine, smoky and rose quartz, phantoms, scepters, Japan-law twins, rutilated quartz and Herkimer diamonds, with honest notes on treatment, care and…
Fine Mineral Specimen Grades Explained: Fine, Premium and Exhibition
A specimen's grade measures crystal quality, damage, colour saturation and rarity together — never size alone. Olemina sorts every fine mineral specimen into three honest tiers: Fine Specimen,…
Why Locality Matters: Provenance in Fine Mineral Collecting
Locality and provenance shape a specimen's authenticity, scarcity and price. Mine-level documentation, named pockets and old collection labels separate a defensible, resaleable piece from an anonymous, unverifiable rock.
Mineral Specimen Sizes Explained: Thumbnail, Miniature, Cabinet
Mineral specimen sizes run from thumbnail to museum scale. Here is what thumbnail, miniature, small cabinet and cabinet actually mean, how they are measured, and which size suits…
Are Fine Mineral Specimens a Good Investment?
Fine mineral specimens can appreciate, but only the top tier rewards it: rare, undamaged, well-provenanced pieces from significant localities. Here is what genuinely drives value, which pieces tend…
What Makes a Fine Mineral Specimen? The 6 Things Collectors Look For
A fine specimen is judged on six things together — crystal form, colour, lustre, condition, rarity and provenance — not on size alone, which only ever matters once…
How to Start a Fine Mineral Collection: A Beginner’s Guide
Start with one clear focus, buy fewer but genuinely better pieces, and learn to judge crystal form, colour, condition and provenance before you ever look at the price…