Log InRegister
Search For:
Mineral Name:
Locality Name:
Keyword(s):
 
Home PageAbout MindatThe Mindat ManualHistory of MindatCopyright StatusWho We AreOur ScienceMindat Newsletter [Free Download]Contact Us
Donate to MindatSponsor a PageCorporate SponsorshipSponsored Pages
Learning CenterWhat Is a Mineral?The Most Common Minerals on EarthInformation for EducatorsMindat ArticlesMindat Newsletter [Free Download]The ElementsThe Mineral Quiz
Search FormMinerals by PropertiesMinerals by ChemistryMineral Visual ExplorerAdvanced Locality SearchRandom MineralRandom LocalitySearch by minIDMinerals by CountryAlphabetical Mineral IndexAlphabetical Locality SearchMineral Association SearchList of CountriesLocalities Near MePhoto SearchSearch ArticlesSearch GlossaryThe Rock H. Currier Digital LibraryMore Search Options
The Mindat ManualAdd a New PhotoRate PhotosLocality Edit ReportCoordinate Completion ReportAdd Glossary Item
MineralsPetrologyFossilsMeteoritesGeologic Time
Mining CompaniesStatisticsMineral MuseumsClubs & OrganizationsMineral Shows & EventsDevice SettingsTime Machine
Read DiscussionsIdentification Request
Photo SearchPhoto GalleriesSearch by ColourPhoto Colour ExplorerNew Photos TodayNew Photos YesterdayMembers' Photo GalleriesPast Photo of the Day GalleryPhotography

Mangari, Taita-Taveta County, Kenyai
Regional Level Types
MangariMining Area
Taita-Taveta CountyCounty
KenyaCountry

This page is currently not sponsored. Click here to sponsor this page.
PhotosMapsSearch
00989110017271980895624.jpg
Tremolite

Mangari, Taita-Taveta County, Kenya
00989110017271980895624.jpg
Tremolite

Mangari, Taita-Taveta County, Kenya
00989110017271980895624.jpg
Tremolite

Mangari, Taita-Taveta County, Kenya
Latitude & Longitude (WGS84):
3° South , 38° East (est.)
Estimate based on other nearby localities or region boundaries.
Margin of Error:
~98km
GRN:
S03E27
Type:
Mining Area
Deposit first discovered:
1973
Köppen climate type:
Aw : Tropical savanna, wet
Mindat Locality ID:
122389
Long-form identifier:
mindat:1:2:122389:0
GUID (UUID V4):
0


A series of small ruby deposits.

The Proterozoic Mozambique Belt contains numerous primary deposits of gem-corundum (i.e., ruby and sapphire). The ruby deposits in the Mangari area of SE Kenya, are among the most productive and best known. Enclosed within a metasedimentary sequence dominated by sillimanite-graphitic gneisses, the Mangari deposits are associated with rootless ultrabasic bodies. Ruby occurs (1) in lenses on the inner side of the contacts between the ultrabasites and the surrounding metasediments and (2) in veins within the ultrabasic bodies or forming their margins. Field relationships reveal that the corundum-bearing rocks are genetically related to the ultrabasic bodies but not to the surrounding gneisses. Laboratory studies and petrographic comparisons indicate that the ruby-bearing rocks crystallized under granulite facies conditions of 700-750°C and 8-10.5 kbar. By contrast, the surrounding gneisses show only amphibolite facies metamorphism with maximum temperatures around 650°C and pressures which did not exceed 7 kbar.

Select Mineral List Type

Standard Detailed Gallery Strunz Chemical Elements

Commodity List

This is a list of exploitable or exploited mineral commodities recorded from this region.


Mineral List

Mineral list contains entries from the region specified including sub-localities

12 valid minerals.

Detailed Mineral List:

ⓘ Corundum
Formula: Al2O3
ⓘ Corundum var. Ruby
Formula: Al2O3
ⓘ 'Garnet Group'
Formula: X3Z2(SiO4)3
ⓘ Graphite
Formula: C
ⓘ Hematite
Formula: Fe2O3
ⓘ Kornerupine
Formula: Mg3Al6(Si,Al,B)5O21(OH)
ⓘ Kyanite
Formula: Al2(SiO4)O
ⓘ Magnetite
Formula: Fe2+Fe3+2O4
ⓘ Muscovite
Formula: KAl2(AlSi3O10)(OH)2
ⓘ Phlogopite
Formula: KMg3(AlSi3O10)(OH)2
ⓘ Sapphirine
Formula: Mg4(Mg3Al9)O4[Si3Al9O36]
ⓘ 'Serpentine Subgroup'
Formula: D3[Si2O5](OH)4
ⓘ Sillimanite
Formula: Al2(SiO4)O
ⓘ Titanite
Formula: CaTi(SiO4)O
ⓘ 'Tourmaline'
Formula: AD3G6(T6O18)(BO3)3X3Z
Description: Green ("V-bearing")
ⓘ Tremolite
Formula: ◻Ca2Mg5(Si8O22)(OH)2

Gallery:

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
ⓘGraphite1.CB.05aC
Group 4 - Oxides and Hydroxides
ⓘMagnetite4.BB.05Fe2+Fe3+2O4
ⓘCorundum4.CB.05Al2O3
ⓘHematite4.CB.05Fe2O3
ⓘCorundum
var. Ruby		4.CB.05Al2O3
Group 9 - Silicates
ⓘSillimanite9.AF.05Al2(SiO4)O
ⓘKyanite9.AF.15Al2(SiO4)O
ⓘTitanite9.AG.15CaTi(SiO4)O
ⓘKornerupine9.BJ.50Mg3Al6(Si,Al,B)5O21(OH)
ⓘTremolite9.DE.10◻Ca2Mg5(Si8O22)(OH)2
ⓘSapphirine9.DH.45Mg4(Mg3Al9)O4[Si3Al9O36]
ⓘMuscovite9.EC.15KAl2(AlSi3O10)(OH)2
ⓘPhlogopite9.EC.20KMg3(AlSi3O10)(OH)2
Unclassified
ⓘ'Tourmaline'-AD3G6(T6O18)(BO3)3X3Z
ⓘ'Garnet Group'-X3Z2(SiO4)3
ⓘ'Serpentine Subgroup'-D3[Si2O5](OH)4

List of minerals for each chemical element

HHydrogen
Hⓘ KornerupineMg3Al6(Si,Al,B)5O21(OH)
Hⓘ MuscoviteKAl2(AlSi3O10)(OH)2
Hⓘ PhlogopiteKMg3(AlSi3O10)(OH)2
Hⓘ Tremolite◻Ca2Mg5(Si8O22)(OH)2
Hⓘ Serpentine SubgroupD3[Si2O5](OH)4
BBoron
Bⓘ KornerupineMg3Al6(Si,Al,B)5O21(OH)
Bⓘ TourmalineAD3G6(T6O18)(BO3)3X3Z
CCarbon
Cⓘ GraphiteC
OOxygen
Oⓘ CorundumAl2O3
Oⓘ HematiteFe2O3
Oⓘ KornerupineMg3Al6(Si,Al,B)5O21(OH)
Oⓘ KyaniteAl2(SiO4)O
Oⓘ MagnetiteFe2+Fe23+O4
Oⓘ MuscoviteKAl2(AlSi3O10)(OH)2
Oⓘ PhlogopiteKMg3(AlSi3O10)(OH)2
Oⓘ Corundum var. RubyAl2O3
Oⓘ SapphirineMg4(Mg3Al9)O4[Si3Al9O36]
Oⓘ SillimaniteAl2(SiO4)O
Oⓘ TitaniteCaTi(SiO4)O
Oⓘ TourmalineAD3G6(T6O18)(BO3)3X3Z
Oⓘ Tremolite◻Ca2Mg5(Si8O22)(OH)2
Oⓘ Garnet GroupX3Z2(SiO4)3
Oⓘ Serpentine SubgroupD3[Si2O5](OH)4
MgMagnesium
Mgⓘ KornerupineMg3Al6(Si,Al,B)5O21(OH)
Mgⓘ PhlogopiteKMg3(AlSi3O10)(OH)2
Mgⓘ SapphirineMg4(Mg3Al9)O4[Si3Al9O36]
Mgⓘ Tremolite◻Ca2Mg5(Si8O22)(OH)2
AlAluminium
Alⓘ CorundumAl2O3
Alⓘ KornerupineMg3Al6(Si,Al,B)5O21(OH)
Alⓘ KyaniteAl2(SiO4)O
Alⓘ MuscoviteKAl2(AlSi3O10)(OH)2
Alⓘ PhlogopiteKMg3(AlSi3O10)(OH)2
Alⓘ Corundum var. RubyAl2O3
Alⓘ SapphirineMg4(Mg3Al9)O4[Si3Al9O36]
Alⓘ SillimaniteAl2(SiO4)O
SiSilicon
Siⓘ KornerupineMg3Al6(Si,Al,B)5O21(OH)
Siⓘ KyaniteAl2(SiO4)O
Siⓘ MuscoviteKAl2(AlSi3O10)(OH)2
Siⓘ PhlogopiteKMg3(AlSi3O10)(OH)2
Siⓘ SapphirineMg4(Mg3Al9)O4[Si3Al9O36]
Siⓘ SillimaniteAl2(SiO4)O
Siⓘ TitaniteCaTi(SiO4)O
Siⓘ Tremolite◻Ca2Mg5(Si8O22)(OH)2
Siⓘ Garnet GroupX3Z2(SiO4)3
Siⓘ Serpentine SubgroupD3[Si2O5](OH)4
KPotassium
Kⓘ MuscoviteKAl2(AlSi3O10)(OH)2
Kⓘ PhlogopiteKMg3(AlSi3O10)(OH)2
CaCalcium
Caⓘ TitaniteCaTi(SiO4)O
Caⓘ Tremolite◻Ca2Mg5(Si8O22)(OH)2
TiTitanium
Tiⓘ TitaniteCaTi(SiO4)O
FeIron
Feⓘ HematiteFe2O3
Feⓘ MagnetiteFe2+Fe23+O4

Localities in this Region

Kenya

Other Regions, Features and Areas containing this locality

AfricaContinent
African Plate
Kenya
Somali PlateTectonic Plate

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.

References

Mercier, A.; Debat, P.; Saul, John M. (1999) Exotic origin of the ruby deposits of the Mangari area in SE Kenya. Ore Geology Reviews, 14 (2). 83-104 doi:10.1016/s0169-1368(99)00002-5
Quick NavTopCommoditiesMineral ListLocalities in RegionOther RegionsReferences
 
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: October 19, 2026 09:23:54 Page updated: October 30, 2025 06:20:40
Go to top of page