What is Scheelite?
Scheelite (CaWO₄) is a calcium tungstate mineral and the most important ore of tungsten — a critical industrial metal used in hard alloys, cutting tools, and incandescent light bulb filaments. Named after Swedish chemist Carl Wilhelm Scheele, who discovered tungsten in 1781, scheelite is beloved by collectors for its beautiful crystal form, warm golden color, and extraordinary fluorescence under ultraviolet light.
Scheelite crystallizes in the tetragonal system, forming distinctive dipyramidal (double-pyramid) crystals that resemble two four-sided pyramids joined at their bases. This elegant octahedron-like shape, combined with adamantine to vitreous luster, makes scheelite instantly recognizable. Colors range from golden yellow and amber to orange, brown, and rarely colorless or pale green. The mineral occurs in contact metamorphic deposits (skarns), hydrothermal veins, and pegmatites.
Physical Properties and Identification
- Chemical formula: CaWO₄ (calcium tungstate)
- Crystal system: Tetragonal
- Hardness: 4.5–5 on the Mohs scale
- Luster: Adamantine to vitreous (bright, brilliant)
- Specific gravity: 5.9–6.1 (very heavy)
- Cleavage: Distinct in two directions
- Streak: White
- Fluorescence: Strong bright blue-white under shortwave UV (diagnostic)
Scheelite is identified by its dipyramidal crystal form, very high specific gravity (feels remarkably heavy), adamantine luster, and diagnostic fluorescence — under shortwave UV light, scheelite glows a vivid blue-white that is unmistakable. This fluorescence is so reliable that prospectors use UV lamps to locate scheelite deposits in the field.
Famous Scheelite Localities
China is the dominant source of both industrial tungsten and fine scheelite specimens. Hunan, Jiangxi, and Yunnan provinces produce exceptional golden-yellow dipyramidal crystals, often on quartz or muscovite matrix. Chinese scheelite offers outstanding quality at accessible prices, with specimens ranging from thumbnail-sized gems to large cabinet pieces.
Tong Wha Mine, South Korea and Hollinger Mine, Ontario, Canada have produced classic scheelite specimens prized by collectors. Arizona, USA yields fine scheelite from various skarn deposits. Peru (Pasto Bueno) produces exceptional specimens with sharp crystals on quartz matrix. Japan, Austria (Felbertal), and Australia also contribute notable material to the collector market.
Collecting Scheelite: What to Look For
Crystal form: Sharp, well-defined dipyramidal crystals with clean faces and pointed terminations are most desirable. The classic octahedron-like shape should be symmetrical and well-proportioned. Twinned crystals, while less common, add collector interest.
Color and transparency: Rich golden-yellow to amber scheelite with good transparency commands the highest prices. Gem-quality transparent crystals are rare and valuable. Deeper colors generally indicate higher quality, though pale specimens with exceptional crystal form are also collectible.
Luster: Scheelite should display bright adamantine to vitreous luster — a brilliance that makes the mineral gleam almost like a gemstone. Dull or waxy surfaces suggest weathering or lower quality.
Fluorescence: Test specimens under shortwave UV light. Strong, even blue-white fluorescence confirms identity and adds display versatility — a scheelite collection displayed under UV creates a stunning glowing effect.
Weight: Scheelite’s very high specific gravity (5.9–6.1) is immediately noticeable. A well-formed crystal feels surprisingly heavy, adding to the tactile pleasure of collecting this mineral.
Care, Handling, and Display
Scheelite is moderately durable at hardness 4.5–5 but has distinct cleavage that can make crystals vulnerable to impact damage. Handle with care and store in padded compartments. Clean with a soft brush and lukewarm water; avoid ultrasonic cleaners.
Scheelite is not light-sensitive and maintains its color under permanent display lighting. The adamantine luster looks best under focused LED spotlights that bring out the golden brilliance. Dark backgrounds maximize visual impact.
The real display magic of scheelite is its UV fluorescence. Consider installing a switchable shortwave UV light in your display case — at the flick of a switch, golden scheelite transforms into glowing blue-white beacons. This dual-lighting display is one of the most impressive effects available to mineral collectors and never fails to captivate visitors.
Scheelite vs. Powellite
Scheelite forms a complete solid solution series with powellite (CaMoO₄), where molybdenum substitutes for tungsten. Both are tetragonal tungstates/molybdates with similar crystal forms. Powellite tends to be lighter colored (cream to yellow) and fluoresces golden-yellow under UV rather than scheelite’s blue-white. Intermediate compositions exist, and fluorescence color shifts accordingly — a useful diagnostic tool for determining the tungsten-to-molybdenum ratio.
Shop Scheelite at My Mineral Box
Browse our collection of scheelite specimens featuring golden dipyramidal crystals with brilliant adamantine luster and stunning UV fluorescence. Every piece is hand-selected for crystal form, color, and display quality. Explore our full mineral collection today.
