Preliminary identification
Photo reference
2 uploaded photos
Overview
This is a large, raw piece of satin spar, a fibrous variety of gypsum often commercially sold under the trade name 'selenite.' It features long, parallel crystalline fibers that channel light along its length, creating a soft, pearly chatoyant sheen.
Story
Formed millions of years ago as ancient salt lakes evaporated, this specimen grew fiber by fiber under immense geological pressure. It acts as a natural fiber-optic cable, conducting light along its interior strands.
Maker / Origin
Likely likely morocco or mexico.
Condition & Value
Appears in typical raw, rough-cleaved condition with natural flaking and minor surface debris along the fiber edges. Gypsum is very soft (Mohs hardness 2), so minor edge wear is standard and expected. Value for satin spar specimens is primarily driven by weight, size, and clarity.
Full Research
Sold comps, value drivers, and venue guidance pulled from recent auction results.
Your first full report is on us.
See sold comps, value drivers, and where to sell. One complimentary report, no card required.
Comparable demand stays strongest where maker, originality, and venue confidence line up. Broader examples still trade, but the range tightens quickly when provenance, condition, or selling lane fit is missing.
Best Venue
Specialty auction or a focused dealer with buyers already in this lane.
Signed example with light edge wear and original frame.
Comparable format with stronger provenance and cleaner surface.
Smaller related piece with visible craquelure and trimmed margins.
Period match with softer condition and weaker subject matter.
Close market lane comp with similar material and presentation.