SUPPORT US. Covid-19 has significantly affected our fundraising. Please help!
Log InRegister
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 ElementsBooks & Magazines
Minerals by PropertiesMinerals by ChemistryAdvanced Locality SearchRandom MineralRandom LocalitySearch by minIDLocalities Near MeSearch ArticlesSearch GlossaryMore Search Options
Search For:
Mineral Name:
Locality Name:
The Mindat ManualAdd a New PhotoRate PhotosLocality Edit ReportCoordinate Completion ReportAdd Glossary Item
Mining CompaniesStatisticsUsersMineral MuseumsMineral Shows & EventsThe Mindat DirectoryDevice Settings
Photo SearchPhoto GalleriesNew Photos TodayNew Photos YesterdayMembers' Photo GalleriesPast Photo of the Day GalleryMineral Photography

Dennis Armbruster's Photo Gallery

R79-EVDCalcite CaCO3

Amboy Crater, Amboy, San Bernardino Co., California, USA

Here is a photo of just one of the smaller pieces of what I believe is pseudomorphed calcite scalenohedrons in a star pattern with a nice butterfly twin. I'm not sure what mineral replaced the calcite but it seems to be almost completely black. Many specimens have very small quartz crystals jutting out from them and are covered by druzy quartz. An American quarter is beside this specimen for size reference. I have about 20 pounds of this material and would appreciate any help that I can get to identify exactly what mineral this is. This specimen was hand collected by Dennis Armbruster in March 2008. Feel free to contact me at or
Photo ID: 158976     Uploaded by: Dennis Armbruster   View Count: 894   Approval status: Public galleries    Type: Photo - 640 x 480 pixels (0.3 Mpix)
Page 1 of 1 (1 to 1 of 1 total)
Mineral and/or Locality is an outreach project of the Hudson Institute of Mineralogy, a 501(c)(3) not-for-profit organization. Public Relations by Blytheweigh.
Copyright © and the Hudson Institute of Mineralogy 1993-2020, except where stated. Most political location boundaries are © OpenStreetMap contributors. relies on the contributions of thousands of members and supporters.
Privacy Policy - Terms & Conditions - Contact Us Current server date and time: August 9, 2020 00:21:14
Go to top of page