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Grossular (hessonite) - Jeffrey Quarry, Asbestos, Quebec, Canada

Grossular from the Jeffrey Quarry, Quebec is one of our Top 100 Minerals.

Grossular is a calcium aluminum silicate. It is a member of the garnet group which is dominated by six species: almandine, pyrope, spessartine, grossular, andradite and uvarovite. Hessonite is a cinnamon-colored gem variety of grossular.

While the main ore at the Jeffrey mine is asbestos---fibrous serpentine group minerals, such as the chrysotiles, antigorite and lizardite---the locality is primarily known to collectors as the producer of some of the world's finest and gemmiest grossular and vesuvianite. These minerals are found in a rock known as rodingite, a grossular and diopside dominant rock produced when granitic dikes hosted by iron- and magnesium-rich rocks are altered by calcium-bearing hydrothermal solutions.  At the Jeffrey mine, the main orebody is a package of ultramafic rocks and is cut by granitic dikes. It is at the contact of these two rock types that the rodingites formed during the serpentinization of the former.

Specimens of grossular from this locality are commonly associated with diopside, unusually distinct prehnite crystals and acicular pectolite.


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GARNET var. GROSSULAR var. CHROMIAN, DIOPSIDE
Jeffrey mine, Val-des-Sources (Asbestos), Les Sources RCM, Estrie, Quebec, Canada
$125
44mm x 28mm x 24mm
Vesuvianite Showing Natural Bend
Jeffrey Mine, Asbestos, Quebec, Canada
$2000
50mm x 10mm x 10mm
gem pink GARNET var. GROSSULAR, DIOPSIDE
Jeffrey mine, Val-des-Sources (Asbestos), Les Sources RCM, Estrie, Quebec, Canada
$580
40mm x 32mm x 31mm
Grossular
Jeffrey quarry, Asbestos, Quebec, Canada
$230
30mm x 20mm x 10mm
Vesuvianite
Jeffrey Mine, Val-des-Sources, Estrie, Québec, Canada
$2750
60mm x 20mm x 10mm
gem GARNET var. GROSSULAR, DIOPSIDE
Jeffrey mine, Val-des-Sources (Asbestos), Les Sources RCM, Estrie, Quebec, Canada
$485
84mm x 46mm x 58mm
gem GARNET var. GROSSULAR
Jeffrey mine, Val-des-Sources (Asbestos), Les Sources RCM, Estrie, Quebec, Canada
$220
12mm x 12mm x 5mm
Hessonite garnet.
Jeffrey Mine, Asbestos, Quebec, Canada
$1106 *
67mm x 65mm x 31mm
From: A Bijoux
gem GARNET var. GROSSULAR with GREEN CHROMIAN PHANTOMS, DIOPSIDE
Jeffrey mine, Val-des-Sources (Asbestos), Les Sources RCM, Estrie, Quebec, Canada
$280
35mm x 22mm x 16mm
Grossular Garnet
Jeffrey Mine, Val-des-Sources, Estrie, Québec, Canada
$750
20mm x 10mm x 10mm
Grossular var. Chromian Grossular on Diopside
Jeffrey Mine, Asbestos, Québec, Canada
$48 *
25mm x 19mm x 16mm
Pectolite.
Jeffrey Mine, Estrie, Québec, Canada
$1373 *
50mm x 44mm x 19mm
From: A Bijoux
gem GARNET var. GROSSULAR
Jeffrey mine, Val-des-Sources (Asbestos), Les Sources RCM, Estrie, Quebec, Canada
$95
9mm x 8mm x 7mm
gem VESUVIANITE var. CHROMIAN, GARNET var. GROSSULAR
Jeffrey mine, Val-des-Sources (Asbestos), Les Sources RCM, Estrie, Quebec, Canada
$80
13mm x 10mm x 13mm
gem GARNET var. GROSSULAR
Jeffrey mine, Val-des-Sources (Asbestos), Les Sources RCM, Estrie, Quebec, Canada
$3380
80mm x 51mm x 36mm
DIOPSIDE
Jeffrey mine, Val-des-Sources (Asbestos), Les Sources RCM, Estrie, Quebec, Canada
$35
13mm x 11mm x 9mm
gem GARNET var. GROSSULAR var. CHROMIAN, CHROMITE
Jeffrey mine, Val-des-Sources (Asbestos), Les Sources RCM, Estrie, Quebec, Canada
$85
10mm x 7mm x 7mm
gem GARNET var. GROSSULAR with GREEN CHROMIAN PHANTOMS
Jeffrey mine, Val-des-Sources (Asbestos), Les Sources RCM, Estrie, Quebec, Canada
$115
18mm x 15mm x 12mm
Vesuvianite var. Manganoan
Jeffrey mine, Asbestos, Les Sources RCM, Quebec, Canada
$1500
20mm x 10mm x 10mm
gem pink GARNET var. GROSSULAR, DIOPSIDE
Jeffrey mine, Val-des-Sources (Asbestos), Les Sources RCM, Estrie, Quebec, Canada
$1850
65mm x 59mm x 32mm
* price is an approximate conversion and may not be accurate.

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