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 HelpUnknown Guatemalan Mineral Found
19th Nov 2016 18:21 UTCRobert Darabos
These are photos of a mineral I found.
At first I thought it may be junk or garbage, etc. But I've been finding these all over. Including inside cliff formations.
It is very light and somewhat brittle. With enough effort I can break a piece in piece with my hands.
It's weight feels even lighter than Pumice. That I know of, there are no volcanoes in the area, so probably not Pumice or any type of volcanic rock (it could be, but I'm leaning towards it not being that.)
The Huehuetenango area use to be at the bottom of the ocean around 300 million years ago, so one of my guesses was fossilized plants or coral.
My second guess was Laumontite Quartz Cast, as it feels similar to Laumontite I've found in New Jersey.
There also appears to be small crystal-type formations in the matrix, perhaps silica or mica?
Any ideas?
19th Nov 2016 18:27 UTCBecky Coulson 🌟 Expert
https://en.wikipedia.org/wiki/List_of_volcanoes_in_Guatemala
19th Nov 2016 19:46 UTCRobert Darabos
Before I arrived in Guatemala i was digging in Puebla, Mexico, for volcanic material, near the Popo volcano. I had thought it was Pumice i was finding, but it seems much heavier than this material.
Any ideas what this would be? Could it just be a different type of pumice?
19th Nov 2016 20:55 UTCReiner Mielke Expert
19th Nov 2016 21:06 UTCBecky Coulson 🌟 Expert
The image is not very clear on my monitor, but it does look like pyroclastic material (ignimbrite or tuff), which can contain bits of pumice along with other materials that come exploding out of a volcano. Pumice per se is a solidified, glassy froth, but the chemistry can vary, although it is usually so porous and light that it temporarily "floats".
What a great place to collect!
20th Nov 2016 02:09 UTCPaul Brandes 🌟 Manager
First one looks like a typical pumice, especially with the weight you describe.
Second one looks like a pyroclastic, probably a tuff.
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 23, 2024 11:34:26
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 23, 2024 11:34:26