Vote for your favorite mineral in #MinCup26! - Sphalerite vs. Anorthite
Both zinc ore Sphalerite and calcium plagioclase feldspar Anorthite have perfect cleavage that will split cleanly if you hit them with a hammer, but only one can claim a larger split of your votes!
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 TimeExplore Fossils
Minerals by PropertiesMinerals by ChemistryMineral Visual ExplorerAdvanced 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 QuizTime Machine
Photo SearchPhoto GalleriesSearch by ColorPhoto Colour ExplorerNew Photos TodayNew Photos YesterdayMembers' Photo GalleriesPast Photo of the Day GalleryPhotography

Amatite

A variety of Opal
This page is currently not sponsored. Click here to sponsor this page.
Formula:
SiO2 · nH2O
Opal formed of thick mounds deposited from hot silica-rich springs.


Hide all sections | Show all sections

Unique IdentifiersHide

Mindat ID:
7995 (as Amatite)
3004 (as Opal)
Long-form identifier:
mindat:1:1:7995:8 (as Amatite)
mindat:1:1:3004:1 (as Opal)

Similar NamesHide

AgmatiteA rock classification type
AmantiteA synonym of 'Oligoclase'
AmiatitA synonym of 'Fiorite'
AmiatiteA rock subtype
ApatiteA group of related mineral speciesCa5(PO4)3A
Apatite-(CaCl)A synonym of Chlorapatite
Apatite-(CaF)A synonym of Fluorapatite
Apatite-(CaOH)A synonym of Hydroxylapatite
Apatite-(CaOH)-MA synonym of 'Hydroxylapatite-M'
Apatite-(SrOH)A synonym of Fluorstrophite
AyatiteA synonym of Corundum
EmatiteA synonym of Hematite
EmetiteA synonym of 'Unnamed (K-Na-Ca Sulphate)'

Chemistry of AmatiteHide

Mindat Formula:
SiO2 · nH2O
Element Weights:
Element% weight
O61.458 %
Si35.961 %
H2.581 %

Calculated from ideal end-member formula.
Elements listed:
H, O, Si - search for minerals with similar chemistry

Other Language Names for AmatiteHide

German:Amatit
Spanish:Amatita

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

Internet Links for AmatiteHide

References for AmatiteHide

Reference List:
Quick NavTopUnique IdentifiersSimilar NamesChemistry Other LanguagesOther InformationInternet Links References
 
and/or  
Mindat.org® is an outreach project of the Hudson Institute of Mineralogy, a 501(c)(3) not-for-profit organization. Mindat® and mindat.org® are registered trademarks of the Hudson Institute of Mineralogy.
Copyright © mindat.org and the Hudson Institute of Mineralogy 1993-2026, 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 and Ida Chau.
Content on this site may not be used to train, fine-tune, or otherwise develop artificial intelligence or machine learning models without prior written permission - see our Terms & Conditions.
To cite: Ralph, J., Von Bargen, D., Martynov, P., Zhang, J., Que, X., Prabhu, A., Morrison, S. M., Li, W., Chen, W., & Ma, X. (2025). Mindat.org: The open access mineralogy database to accelerate data-intensive geoscience research. American Mineralogist, 110(6), 833–844. doi:10.2138/am-2024-9486.
Privacy Policy - Terms & Conditions - Contact Us / DMCA issues - Report a bug/vulnerability Current server date and time: September 3, 2026 06:21:29 Page updated: July 21, 2026 02:38:26
Go to top of page