rodingite

rodingite

[′rōd·iŋ‚gīt]
(petrology)
A medium- to coarse-grained, commonly calcium-enriched gabbroic rock containing grossular and diallage as essential minerals.
References in periodicals archive ?
The rodingite rocks of the Monviso Massif have produced fine specimens of grossular, as well as diopside, perovskite, titanite, vesuvianite and apatite.
In September 2005 a huge pocket was breached, presumably in the deposit's rodingite vein area, where nearly all the good grossulars, vesuvianites and diopsides have been found in the past.
Bornite is uncommon as tarnished, purple-black, iridescent masses and veinlets in rodingite. A few crude dodecahedrons visually identified as bornite were found with grossular crystals, diopside crystals and chalcopyrite in 2000-2001.
Chalcocite is found as nondescript black metallic masses in rodingite with grossular and diopside.
Clinochlore is found as veins of green platy crystals in serpentine, and as very fine quality crystals in cavities to 1 cm in the rodingite. Some pale green crystals are paper-thin and translucent.
Sharp, slightly modified dodecahedral grossular crystals to 2 cm line cavities in a rodingite vein; the orange-brown to honey-brown crystals cluster densely, in mounds, on mottled gray-green to tan matrix, in specimens from toenail to small-cabinet size.
At the end of 1996 and during the first months of 1997, several good specimens of orange grossular were collected when active workings at the mine crossed a rodingite vein famous for hosting these classical garnets (workings are benched, and this vein is only crossed by a bench at intervals of several years).
The famous grossular garnets are found in fractures in red syenite and in the albitites and rodingites which are included in the dunite and peridotite.
The specimens are presumed to have occurred in rodingite veins in serpentinite at the Rubberoid Asbestos mine.
[square] v.1/n.4 Colombian Emerald, Natrolite (OR), Benstonite (IL), Langban (Sweden) $30 [square] v.8/n.5 Characterization of New Species, Twinning, Axinite (Brazil), Green River (WY) [square] v.9/n.4 Elmwood mine (TN), Chester (MA), Pyrite crystal forms [square] v.9/n.5 Kammererite (Turkey), Afghanistan pegmatites, Chuquicamata, Chile [square] v.9/n.6 Libethenite (Zambia), Quartz/Pyrite (Washington), Hydroboracite (CA) [square] v.10/n.1 Hydroxylherderite (Brazil), References on American Minerals [square] v.10/n.2 Jeffrey mine (Quebec), Alpine Rodingites, Fluorite (Germany) [square] v.10/n.3 Taewha mine (Korea), Quartz Japan-law Twins, Bancroft (Ontario) [square] v.10/n.5 Thomas and Wah Wah Mountains (UT) Topaz, Red Beryl, Etc.
The oceanic metamorphic event transformed the gabbros into rodingites, while iron and copper sulfides were deposited by hydrothermal activity.