Search Archived Mineral Specimens

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Locality

Orford Nickel mine, Estrie, Quebec, Canada

Formula

Ca₃Al₂(SiO₄)₃

Size

SmCabinet 4x5.5x4.5cm

Thick coverage of bright green Chromian Grossular Garnets to 1mm on a mass of prismatic green-brown Diopside.

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Locality

Franklin, Sussex Co., New Jersey, United States

Formula

Ca₃Al₂(SiO₄)₃

Size

SmCabinet 6x6x2.5cm

This specimen is what was called caswellite in old literature, but has since been redescribed as mostly Grossular garnet replacing either hendricksonite or phlogopite mica. Analytical results are somewhat open to interpretation according to Dunn and has shown the replacement may also be to varying degrees Vesuvianite, chlorite and "other phases" perhaps Andradite.  It is fascinating to note that the relict mica cleavages are shown perfectly.

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Locality

Bellecombe, Châtillon, Aosta Valley, Italy

Formula

Ca₃Al₂(SiO₄)₃

Size

Thumbnail 2x2x1cm

Similar to the other specimen, this one with 3-4mm crystals of hessonite garnet with two faceted garnet gems each to 4mm.

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Locality

Franklin, Sussex Co., New Jersey, United States

Formula

Ca₃Al₂(SiO₄)₃

Size

SmCabinet 9x6x8cm

This is the weird platy variety of Grossular they called "caswellite" originally. Apparently this is actually a pseudomorph after muscovite. The dark red coarse crystalline material is Andradite.

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Locality

Crestmore, Riverside Co., California, United States

Formula

Ca₃Al₂(SiO₄)₃

Size

SmCabinet 9x6x3.5cm

A very nice Grossular specimen, well-formed, to 1.1cm. Many are sharp crystals with a good orange-brown color in a blue Calcite matrix. Collected by the late Fred DeVito.

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Locality

Sierra de Cruces, Coahuila, Mexico

Formula

Ca₃Al₂(SiO₄)₃

Size

Thumbnail 2.3x2.1x1cm

Bright red nicely formed crystals of Grossular garnet from this famous locality. These crystals have good luster and sharpness to them, unlike a lot of the competition. Excellent thumbnail.