Guide
Grossular specimens for sale
52 for sale · $50–$12,500 USD
519 in the gallery
Grossular is a calcium aluminum silicate in the garnet group, typically forming isometric crystals that can display a glassy to resinous lustre. The mineral commonly occurs as dodecahedra or trapezohedra, often colorless to pale green, with richer hues appearing in varieties such as tsilaisite and hydrogrossular. Specimens are frequently found in metamorphosed limestones and skarns, where fluid-rich environments promote crystallization of garnet under pressures and temperatures characteristic of low to medium-grade metamorphism.
- Formula
- Ca3Al2(SiO4)3
- Rarity
- Common
- Stability
- Stable
- Collector interest
- High Interest
- Classification notes
- Silicate mineral; nesosilicate – garnet group
Key characteristics
- Crystal system
- isometric
- Mohs hardness
- 6.5–7.5
- Specific gravity
- 3.57–3.73
- Luster
- vitreous, resinous
- Transparency
- transparent, translucent, opaque
- Color
- colorless, white, gray, brown, red, orange, yellow, green, pink
- Streak
- white
- Cleavage
- none
- Fracture
- conchoidal, uneven
- Crystal habit
- dodecahedral, granular, massive, equant
- Gem mineral
- Classic / historic
Buy Grossular specimens
View all 52Where Grossular is found
Top localities
- Jeffrey Mine162 specimens
- Belvidere Mountain Quarries23 specimens
- Vesper Peak21 specimens
- Merelani Hills20 specimens
- Sierra de Cruces20 specimens
- Ala Valley11 specimens
- Kayes Region8 specimens
- Diakon5 specimens
- Stifle Claims4 specimens
- Bellecombe3 specimens
Guides
All guides
Guide
Grossular from Merelani Hills, Tanzania
Grossular from Merelani Hills, Tanzania - green tsavorite garnet with gem-quality, sharp crystals, bright luster, and Merelani morphology prized by collectors.Read guide
Guide
Grossular from Jeffrey Mine, Canada
Grossular from Jeffrey Mine, Canada - gemmy orange to pink garnet on diopside-bearing matrix, classic rodingite formation, prized for color and rarity.Read guide
Guide
Grossular from Ala Valley, Italy
Grossular from Ala Valley, Italy — Alpine hessonite with red-orange crystals in rodingite, prized for color, Alpine locality history, and striking matrix.Read guideAbout Grossular
Notable localities include Canada, the United States, Italy, Mexico, and Tanzania, where Grossular-bearing rocks yield well-formed crystals and aggregates in pockets within skarn deposits, contact metamorphic zones, and hydrothermal veins. Collectors prize Sharp, well-formed crystals with vibrant green coloration, as well as richly colored aggregated masses that reveal the mineral’s characteristic garnet refractive surface. The balance of color, clarity, and crystal form makes Grossular a versatile addition to many mineral cabinets and display cases.
