Catalog Search Guide
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Hessonite
Hessonite is the cinnamon-orange to reddish-brown gem variety of grossular, a calcium-aluminum member of the garnet group with the formula Ca3Al2(SiO4)3. Its warm honey, cinnamon, and brownish-red hues come from trace ferric iron and manganese substituting in the crystal lattice, and the name itself derives from the Greek "hesson," meaning inferior, a reference to its slightly lower hardness (6.5-7 Mohs) and specific gravity compared to other garnets. Collectors and gemologists prize hessonite above all for its signature "heat-wave" or treacly optical effect, an internal swirling caused by strained growth zones that no other orange gem quite replicates, distinguishing it from lookalikes such as spessartine (mandarin garnet) and citrine.
Sri Lanka remains the classic source, with gem-quality crystals recovered from the alluvial gem gravels of the Ratnapura district within the ancient Highland Complex metamorphic terrane. Fine specimens also come from Orissa in India, and from placer and skarn deposits in Madagascar, Tanzania, and Brazil. For mineral specimen collectors rather than gem cutters, some of the most historically important crystallized material comes from Canada, especially the Jeffrey Mine at Val-des-Sources (formerly Asbestos), Quebec, famed for sharp, pinkish-orange dodecahedral crystals embedded in asbestos-bearing serpentinite. In Europe, the alpine locality of Ala di Stura in Piedmont, Italy, and numerous Austrian occurrences (mindat records over two dozen) have long supplied cabinet-grade hessonite, while in the United States the Belvidere Mountain quarries of Vermont, Lowell and Eden, are classic sources for New England collectors. These deposits typically form where impure, argillaceous limestones and calc-silicate skarns undergo regional or contact metamorphism, associating hessonite with diopside, vesuvianite, wollastonite, and wernerite.
For specimen collectors, hessonite offers an appealing combination of scientific interest and aesthetic warmth: well-formed rhombic dodecahedra and trapezohedra on matrix are sought from Quebec and the Alps, while loose, lustrous crystals from Sri Lankan gem gravels showcase the variety's full cinnamon-to-honey color range. Its place within the broader grossular and garnet group, alongside green tsavorite, pink and white grossular, and other calcium-aluminum silicates, makes it a natural addition to any systematic garnet or skarn-mineral collection, and its longstanding role as the traditional "cinnamon stone" and Vedic gomed gem adds cultural depth to its mineralogical appeal.
HESSONITE, CLINOCHLORE & DIOPSIDE – Red Alpine Garnet, Bellecombe, Italy
