Log InRegister
Quick Links : The Mindat ManualThe Rock H. Currier Digital LibraryMindat Newsletter [Free Download]
Home PageAbout MindatThe Mindat ManualHistory of MindatCopyright StatusWho We AreContact UsAdvertise on Mindat
Donate to MindatCorporate SponsorshipSponsor a PageSponsored PagesMindat AdvertisersAdvertise on Mindat
Learning CenterWhat is a mineral?The most common minerals on earthInformation for EducatorsMindat ArticlesThe ElementsThe Rock H. Currier Digital LibraryGeologic Time
Minerals by PropertiesMinerals by ChemistryAdvanced Locality SearchRandom MineralRandom LocalitySearch by minIDLocalities Near MeSearch ArticlesSearch GlossaryMore Search Options
Search For:
Mineral Name:
Locality Name:
Keyword(s):
 
The Mindat ManualAdd a New PhotoRate PhotosLocality Edit ReportCoordinate Completion ReportAdd Glossary Item
Mining CompaniesStatisticsUsersMineral MuseumsClubs & OrganizationsMineral Shows & EventsThe Mindat DirectoryDevice SettingsThe Mineral Quiz
Photo SearchPhoto GalleriesSearch by ColorNew Photos TodayNew Photos YesterdayMembers' Photo GalleriesPast Photo of the Day GalleryPhotography

PhotosChromian Grossular

25th Feb 2020 16:03 UTCRichard Gunter Expert

07115300016061483065412.jpg
Chrome-bearing Grossular
Orford Nickel mine, St-Denis-de-Brompton, Le Val-Saint-François RCM, Estrie, Québec, Canada
Copyright © Giovanni Scapin 2019
The cubic appearance and lack of striations or cleavage on the green phase suggests these are Chromian Grossular, which are common at the Orford Mine. The Diopside here is a lighter green and occurs as elongate prisms.

25th Feb 2020 16:55 UTCDonald B Peck Expert

Richard,

The green crystals appear to be rhombic dodecahedrons, consistent with the crystallography of garnets.  And I would guess that the color and locality are consistent with them being chromian.  But color is not a good indicator of species in the garnet group.  You might want to have a chip tested.

Don

25th Feb 2020 17:05 UTCRichard Gunter Expert

Hi Don:

These garnets have been tested several times and there is a Mineralogical Record article on the mine with garnet chemistry. These are garnet and not Diopside.

25th Feb 2020 18:08 UTCUwe Kolitsch Manager

Message sent.

25th Feb 2020 22:25 UTCRichard Gunter Expert

Hi Uwe:

There is a second photograph posted, it was next to the questioned photo,  that has the same problem and should be changed to Chromian Grossular.

26th Feb 2020 10:39 UTCUwe Kolitsch Manager

Fixed.
 
Mineral and/or Locality  
Mindat Discussions Facebook Logo Instagram Logo Discord Logo
Mindat.org is an outreach project of the Hudson Institute of Mineralogy, a 501(c)(3) not-for-profit organization.
Copyright © mindat.org and the Hudson Institute of Mineralogy 1993-2024, except where stated. Most political location boundaries are © OpenStreetMap contributors. Mindat.org relies on the contributions of thousands of members and supporters. Founded in 2000 by Jolyon Ralph.
Privacy Policy - Terms & Conditions - Contact Us / DMCA issues - Report a bug/vulnerability Current server date and time: April 26, 2024 10:57:10
Go to top of page