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
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
╳Discussions
💬 Home🔎 Search📅 LatestGroups
EducationOpen discussion area.Fakes & FraudsOpen discussion area.Field CollectingOpen discussion area.FossilsOpen discussion area.Gems and GemologyOpen discussion area.GeneralOpen discussion area.How to ContributeOpen discussion area.Identity HelpOpen discussion area.Improving Mindat.orgOpen discussion area.LocalitiesOpen discussion area.Lost and Stolen SpecimensOpen discussion area.MarketplaceOpen discussion area.MeteoritesOpen discussion area.Mindat ProductsOpen discussion area.Mineral ExchangesOpen discussion area.Mineral PhotographyOpen discussion area.Mineral ShowsOpen discussion area.Mineralogical ClassificationOpen discussion area.Mineralogy CourseOpen discussion area.MineralsOpen discussion area.Minerals and MuseumsOpen discussion area.PhotosOpen discussion area.Techniques for CollectorsOpen discussion area.The Rock H. Currier Digital LibraryOpen discussion area.UV MineralsOpen discussion area.Recent Images in Discussions
Identity Helptetragonal mineral.
2nd Jul 2012 01:42 UTChomer cole
2nd Jul 2012 04:14 UTCDavid Garske
Dave
2nd Jul 2012 08:38 UTCPeter Haas
Reminds me more of andalusite than pyrite.
30th Jun 2012 20:59 UTChomer cole
30th Jun 2012 21:09 UTCJolyon Ralph Founder
Jolyon
30th Jun 2012 21:29 UTCUwe Ludwig
Uwe Ludwig
1st Jul 2012 21:39 UTCBecky Coulson 🌟 Expert
2nd Jul 2012 08:33 UTCPeter Haas
I see nothing wrong with it - except that I don't think it's pyrite (and the matrix possibly not rhyolite). There is a damage along one edge of the crystal, and the reflections on it can lead one into thinking that the mineral has a golden colour. This taken aside (since we can't be really sure about it), there's nothing left to indicate that it is pyrite. The iron-staining does not necessarily indicate that the mineral is iron-bearing, because there's obviously plenty of iron in the host rock: note the colour along the cleavage plane, which is different from that of the bulk rock (as seen on top of the chunk). The iron does not appear to originate from the mineral in question, as this would have resulted in the formation of a more or less pronounced halo around the crystal.
2nd Jul 2012 09:19 UTCPeter Lyckberg Expert
2nd Jul 2012 12:04 UTCSpencer Ivan Mather
Spencer.
2nd Jul 2012 15:27 UTCD Mike Reinke
Where I used to live, a lot of the blacktopping on parking lots was done with crushed limestone in the mix, and the limestone was loaded with pyrite, so after some few weeks of rain and wear, the oil film was gone from the surface, and gleaming bits of pyrite, a quarter inch square or so, would reflect in the sunlight.. A quick geology lesson to anyone who I went with to Wal-mart. (Sorry; it was a small town, we had no choice!)
2nd Jul 2012 15:48 UTCAlfredo Petrov Manager
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 20, 2024 03:23:35
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 20, 2024 03:23:35