LIVE REPORT! The Sussex Mineral & Fossil Show 2018 - last updated 7 minutes ago. Click here to watch.
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 Articles
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 CompaniesStatisticsThe ElementsUsersBooks & MagazinesMineral MuseumsMineral Shows & EventsThe Mindat DirectoryDevice Settings
Photo SearchPhoto GalleriesNew Photos TodayNew Photos YesterdayMembers' Photo GalleriesPast Photo of the Day Gallery

Antetezambato Demantoid-Topazolite Mine, Antsakoamanondro Commune, Ambanja District, Diana Region (Northern Region), Antsiranana Province, Madagascar

This page is currently not sponsored. Click here to sponsor this page.
Key
Lock Map
Name(s) in local language(s):Fihadiam-batosoan' Antezambato, Kaominin' Antsakoamanondro, Distrikan' Ambanja, Faritr'i Diana, Faritanin' Antsiranana, Madagasikara
Latitude & Longitude (WGS84): 13° 30' 0'' South , 48° 31' 59'' East
Latitude & Longitude (decimal): -13.50000,48.53333
GeoHash:G#: mjde0qkuu
Locality type:Mining Field
Köppen climate type:Am : Tropical monsoon climate


Located 2,5 km W of the village of Antetezambato(which is located in the Maherivaratra Commune). The next-nearest city is Ambanja, around 20 km S of Antetezambato. The mining area covers ~20 hectares.

Groups of lustrous green colored andradite garnets (varieties demantoid and topazolite) crystals with dominant dodecahedron combined with trapezohedron faces weres found here in 2008-09 and presented at the Ste.-Marie-Aux-Mines mineral show in 2009.
The garnets are dug out of weathered intertidal rocks (in a mangrove swamp) which are of contact-metamorphic origin. High-quality material is very rare.

Unusual are pseudomorphs of fine-grained garnet + quartz after shells, corals and even ammonites, associated with demantoid crystals.

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List


6 valid minerals.

Detailed Mineral List:

Andradite
Formula: Ca3Fe3+2(SiO4)3
Reference: Pezzotta, F. (2010): Andradite from Antetezambato, Madagascar. Mineralogical Record 41, 209-229
Andradite var: Demantoid
Formula: Ca3Fe3+2(SiO4)3
Reference: Pezzotta, F. (2009). Demantoide e Topazolite: nuovo ritrovamento in Madgascar. Rivista Mineralogica Italiana, n.3-2009, 198-200; Pezzotta, F. (2010): Demantoid und Topazolith aus Antetezambato, Nordmadagaskar. Lapis, 35 (10), 31-39; 90; Hintze, J. (2010): Eine Reise zu den Demantoiden von Antetezambato. Lapis, 35 (10), 40-43 (in German).
Andradite var: Topazolite
Formula: Ca3Fe3+2(SiO4)3
Reference: Pezzotta, F. (2009). Demantoide e Topazolite: nuovo ritrovamento in Madgascar. Rivista Mineralogica Italiana, n.3-2009, 198-200; Pezzotta, F. (2010): Demantoid und Topazolith aus Antetezambato, Nordmadagaskar. Lapis, 35 (10), 31-39; 90; Hintze, J. (2010): Eine Reise zu den Demantoiden von Antetezambato. Lapis, 35 (10), 40-43 (in German).
Calcite
Formula: CaCO3
Reference: Hintze, J. (2010): Eine Reise zu den Demantoiden von Antetezambato. Lapis, 35 (10), 40-43 (in German).
Pyrite
Formula: FeS2
Reference: Pezzotta, F. (2010): Andradite from Antetezambato, Madagascar. Mineralogical Record 41, 209-229.
Quartz
Formula: SiO2
Reference: Praszkier, T. & Gajowniczek, J. (2010): Demantoide aus Antetezambato auf Madagaskar. Mineralien-Welt 21 (1), 32-41
Stilbite-Ca
Formula: NaCa4[Al9Si27O72] · nH2O
Reference: Pezzotta, F. (2010): Andradite from Antetezambato, Madagascar. Mineralogical Record 41, 209-229
'Stilbite subgroup'
Reference: Robert Lavinsky photo
Wollastonite ?
Formula: CaSiO3
Reference: Pezzotta, F. (2010): Andradite from Antetezambato, Madagascar. Mineralogical Record 41, 209-229.

List of minerals arranged by Strunz 10th Edition classification

Group 2 - Sulphides and Sulfosalts
Pyrite2.EB.05aFeS2
Group 4 - Oxides and Hydroxides
Quartz4.DA.05SiO2
Group 5 - Nitrates and Carbonates
'Calcite'5.AB.05CaCO3
Group 9 - Silicates
'Andradite'9.AD.25Ca3Fe3+2(SiO4)3
var: Demantoid9.AD.25Ca3Fe3+2(SiO4)3
var: Topazolite9.AD.25Ca3Fe3+2(SiO4)3
Stilbite-Ca9.GE.10NaCa4[Al9Si27O72] · nH2O
Wollastonite ?9.DG.05CaSiO3
Unclassified Minerals, Rocks, etc.
Stilbite subgroup-

List of minerals arranged by Dana 8th Edition classification

Group 2 - SULFIDES
AmBnXp, with (m+n):p = 1:2
Pyrite2.12.1.1FeS2
Group 14 - ANHYDROUS NORMAL CARBONATES
A(XO3)
Calcite14.1.1.1CaCO3
Group 51 - NESOSILICATES Insular SiO4 Groups Only
Insular SiO4 Groups Only with cations in [6] and >[6] coordination
Andradite51.4.3b.1Ca3Fe3+2(SiO4)3
Group 65 - INOSILICATES Single-Width,Unbranched Chains,(W=1)
Single-Width Unbranched Chains, W=1 with chains P=3
Wollastonite ?65.2.1.1cCaSiO3
Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si
Quartz75.1.3.1SiO2
Group 77 - TECTOSILICATES Zeolites
Zeolite group - True zeolites
Stilbite-Ca77.1.4.3NaCa4[Al9Si27O72] · nH2O
Unclassified Minerals, Rocks, etc.
Andradite
var: Demantoid
-Ca3Fe3+2(SiO4)3
var: Topazolite-Ca3Fe3+2(SiO4)3
'Stilbite subgroup'-

List of minerals for each chemical element

HHydrogen
H Stilbite-CaNaCa4[Al9Si27O72] · nH2O
CCarbon
C CalciteCaCO3
OOxygen
O AndraditeCa3Fe23+(SiO4)3
O CalciteCaCO3
O Andradite (var: Demantoid)Ca3Fe23+(SiO4)3
O QuartzSiO2
O Stilbite-CaNaCa4[Al9Si27O72] · nH2O
O Andradite (var: Topazolite)Ca3Fe23+(SiO4)3
O WollastoniteCaSiO3
NaSodium
Na Stilbite-CaNaCa4[Al9Si27O72] · nH2O
AlAluminium
Al Stilbite-CaNaCa4[Al9Si27O72] · nH2O
SiSilicon
Si AndraditeCa3Fe23+(SiO4)3
Si Andradite (var: Demantoid)Ca3Fe23+(SiO4)3
Si QuartzSiO2
Si Stilbite-CaNaCa4[Al9Si27O72] · nH2O
Si Andradite (var: Topazolite)Ca3Fe23+(SiO4)3
Si WollastoniteCaSiO3
SSulfur
S PyriteFeS2
CaCalcium
Ca AndraditeCa3Fe23+(SiO4)3
Ca CalciteCaCO3
Ca Andradite (var: Demantoid)Ca3Fe23+(SiO4)3
Ca Stilbite-CaNaCa4[Al9Si27O72] · nH2O
Ca Andradite (var: Topazolite)Ca3Fe23+(SiO4)3
Ca WollastoniteCaSiO3
FeIron
Fe AndraditeCa3Fe23+(SiO4)3
Fe Andradite (var: Demantoid)Ca3Fe23+(SiO4)3
Fe PyriteFeS2
Fe Andradite (var: Topazolite)Ca3Fe23+(SiO4)3

References

Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Pezzotta, F. (2009): Demantoide e Topazolite: nuovo ritrovamento in Madgascar. Rivista Mineralogica Italiana, n.3-2009, 198-200
Praszkier, T. & Gajowniczek, J. (2010): Demantoide aus Antetezambato auf Madagaskar. Mineralien-Welt 21 (1), 32-41.
Pezzotta, F. (2010): Demantoid und Topazolith aus Antetezambato, Nordmadagaskar. Lapis, 35 (10), 31-39; 90.
Hintze, J. (2010): Eine Reise zu den Demantoiden von Antetezambato. Lapis, 35 (10), 40-43 (in German).
Pezzotta, F. (2010): Andradite from Antetezambato, Madagascar. Mineralogical Record 41, 209-229.
Praszkier, T. & Gajowniczek, A. (2010): Visiting Antetezambato, North Madagascar. Mineralogical Record 41, 231-234.
Pezzotta, F., Adamo, I. and Diella, V. (2011) Demantoid and Topazolite from Antetezambato, Northern Madagascar: Review and new data. Gems & Gemology. 47 (1): 2–14.

External Links



This page contains all mineral locality references listed on mindat.org. This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in mindat.org without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.
Mineral and/or Locality  
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 1993-2018, except where stated. Mindat.org relies on the contributions of thousands of members and supporters.
Privacy Policy - Terms & Conditions - Contact Us Current server date and time: November 17, 2018 13:00:08 Page generated: November 17, 2018 02:53:17
Go to top of page