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Amter pegmatite field, Beni Bousera massif, Chefchaouen Province, Tanger-Tetouan-Al Hoceima Region, Moroccoi
Regional Level Types
Amter pegmatite fieldGroup of Pegmatites
Beni Bousera massifMassif
Chefchaouen ProvinceProvince
Tanger-Tetouan-Al Hoceima RegionRegion
MoroccoCountry

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Latitude & Longitude (WGS84):
35° 12' North , 4° 49' West
Latitude & Longitude (decimal):
35.20000,-4.81667
GRN:
N24W03
Type:
Group of Pegmatites
Köppen climate type:
Csa : Hot-summer Mediterranean climate
Nearest Settlements:
PlacePopulationDistance
Chefchaouene36,280 (2016)40.7km
Mahroun600 (2016)41.7km
Tayroukt200 (2016)41.9km
Targuist11,560 (2018)53.9km
Martil39,738 (2016)62.2km
Mindat Locality ID:
476196
Long-form identifier:
mindat:1:2:476196:2
GUID (UUID V4):
0


In its southern portion, a rare set of Miocene LCT pegmatites intruded the serpentinized peridotites, providing a unique case of interaction between peraluminous melts and ultramafic rocks in the Appennino-Maghrebian chain. These pegmatites emerged on the mineral market in 2017, mislabeled as from “Ouarzazate”. Only in 2022 was the true locality identified near Amter. There are documented 270 pegmatitic veins and 112 microgranitoid bodies over a 30 km² area. Pegmatitic veins range from a few centimeters up to ~10 m in length and 1.5 m in thickness, displaying mainly prismatic morphologies. Internally, the Amter pegmatites exhibit five distinct petrographic zones, each associated with characteristic tourmaline morphologies and compositions: Dark mica-rich border zone: Dominated by blades of dark mica (biotite-siderophyllite), often altered to vermiculite. Tourmaline is scarce and Fe-rich, it occurs as a secondary generation.
Aplitic shell: Fine-grained albite and quartz with subordinate tourmaline classified as schorl
Cordierite-bearing graphic zone: Dominated by graphic intergrowths of quartz and feldspar with skeletal cordierite, often altered to muscovite and chlorite. Tourmaline appears as subhedral black crystals with a schorlitic composition
Tourmaline-rich zone: Marked by randomly oriented tourmaline and intergrowth with quartz. The chemical analyses show a foititic composition
Axial miarolitic zone: Hosts large, fan-shaped, isooriented tourmaline aggregates with c-axes perpendicular to the axial plane.

Select Mineral List Type

Standard Detailed Gallery Strunz Chemical Elements

Commodity List

This is a list of exploitable or exploited mineral commodities recorded at this locality.


Mineral List


12 valid minerals.

Rock Types Recorded


Select Rock List Type

Alphabetical List Tree Diagram

Detailed Mineral List:

ⓘ Albite
Formula: Na(AlSi3O8)
ⓘ 'Biotite'
Formula: K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
ⓘ 'Chlorite Group'
ⓘ Cordierite
Formula: Mg2Al4Si5O18
ⓘ Elbaite
Formula: Na(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH)
ⓘ Enstatite
Formula: Mg2Si2O6
ⓘ 'Feldspar Group'
ⓘ Foitite
Formula: ◻(Fe2+2Al)Al6(Si6O18)(BO3)3(OH)3(OH)
ⓘ Forsterite
Formula: Mg2(SiO4)
ⓘ Lizardite
Formula: Mg3(Si2O5)(OH)4
ⓘ Muscovite
Formula: KAl2(AlSi3O10)(OH)2
ⓘ 'Plagioclase'
Formula: (Na,Ca)[(Si,Al)AlSi2]O8
ⓘ Quartz
Formula: SiO2
ⓘ Schorl
Formula: NaFe2+3Al6(Si6O18)(BO3)3(OH)3(OH)
ⓘ 'Serpentine Subgroup'
Formula: D3[Si2O5](OH)4
ⓘ Siderophyllite
Formula: KFe2+2Al(Al2Si2O10)(OH)2
ⓘ 'Smectite Group'
Formula: A0.3D2-3[T4O10]Z2 · nH2O
ⓘ 'Tourmaline'
Formula: AD3G6(T6O18)(BO3)3X3Z
ⓘ Vermiculite
Formula: Mg0.7(Mg,Fe,Al)6(Si,Al)8O20(OH)4 · 8H2O

Gallery:

List of minerals arranged by Strunz 10th Edition classification

Group 4 - Oxides and Hydroxides
ⓘQuartz4.DA.05SiO2
Group 9 - Silicates
ⓘForsterite9.AC.05Mg2(SiO4)
ⓘCordierite9.CJ.10Mg2Al4Si5O18
ⓘElbaite9.CK.05Na(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH)
ⓘFoitite9.CK.05◻(Fe2+2Al)Al6(Si6O18)(BO3)3(OH)3(OH)
ⓘSchorl9.CK.05NaFe2+3Al6(Si6O18)(BO3)3(OH)3(OH)
ⓘEnstatite9.DA.05Mg2Si2O6
ⓘMuscovite9.EC.15KAl2(AlSi3O10)(OH)2
ⓘSiderophyllite9.EC.20KFe2+2Al(Al2Si2O10)(OH)2
ⓘVermiculite9.EC.50Mg0.7(Mg,Fe,Al)6(Si,Al)8O20(OH)4 · 8H2O
ⓘLizardite9.ED.15Mg3(Si2O5)(OH)4
ⓘAlbite9.FA.35Na(AlSi3O8)
Unclassified
ⓘ'Biotite'-K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
ⓘ'Chlorite Group'-
ⓘ'Feldspar Group'-
ⓘ'Tourmaline'-AD3G6(T6O18)(BO3)3X3Z
ⓘ'Plagioclase'-(Na,Ca)[(Si,Al)AlSi2]O8
ⓘ'Smectite Group'-A0.3D2-3[T4O10]Z2 · nH2O
ⓘ'Serpentine Subgroup'-D3[Si2O5](OH)4

List of minerals for each chemical element

HHydrogen
Hⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Hⓘ ElbaiteNa(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH)
Hⓘ Foitite◻(Fe22+Al)Al6(Si6O18)(BO3)3(OH)3(OH)
Hⓘ LizarditeMg3(Si2O5)(OH)4
Hⓘ MuscoviteKAl2(AlSi3O10)(OH)2
Hⓘ SchorlNaFe32+Al6(Si6O18)(BO3)3(OH)3(OH)
Hⓘ SiderophylliteKFe22+Al(Al2Si2O10)(OH)2
Hⓘ VermiculiteMg0.7(Mg,Fe,Al)6(Si,Al)8O20(OH)4 · 8H2O
Hⓘ Smectite GroupA0.3D2-3[T4O10]Z2 · nH2O
Hⓘ Serpentine SubgroupD3[Si2O5](OH)4
LiLithium
Liⓘ ElbaiteNa(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH)
BBoron
Bⓘ ElbaiteNa(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH)
Bⓘ Foitite◻(Fe22+Al)Al6(Si6O18)(BO3)3(OH)3(OH)
Bⓘ SchorlNaFe32+Al6(Si6O18)(BO3)3(OH)3(OH)
Bⓘ TourmalineAD3G6(T6O18)(BO3)3X3Z
OOxygen
Oⓘ AlbiteNa(AlSi3O8)
Oⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Oⓘ CordieriteMg2Al4Si5O18
Oⓘ ElbaiteNa(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH)
Oⓘ EnstatiteMg2Si2O6
Oⓘ Foitite◻(Fe22+Al)Al6(Si6O18)(BO3)3(OH)3(OH)
Oⓘ ForsteriteMg2(SiO4)
Oⓘ LizarditeMg3(Si2O5)(OH)4
Oⓘ MuscoviteKAl2(AlSi3O10)(OH)2
Oⓘ QuartzSiO2
Oⓘ SchorlNaFe32+Al6(Si6O18)(BO3)3(OH)3(OH)
Oⓘ SiderophylliteKFe22+Al(Al2Si2O10)(OH)2
Oⓘ TourmalineAD3G6(T6O18)(BO3)3X3Z
Oⓘ VermiculiteMg0.7(Mg,Fe,Al)6(Si,Al)8O20(OH)4 · 8H2O
Oⓘ Plagioclase(Na,Ca)[(Si,Al)AlSi2]O8
Oⓘ Smectite GroupA0.3D2-3[T4O10]Z2 · nH2O
Oⓘ Serpentine SubgroupD3[Si2O5](OH)4
FFluorine
Fⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
NaSodium
Naⓘ AlbiteNa(AlSi3O8)
Naⓘ ElbaiteNa(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH)
Naⓘ SchorlNaFe32+Al6(Si6O18)(BO3)3(OH)3(OH)
Naⓘ Plagioclase(Na,Ca)[(Si,Al)AlSi2]O8
MgMagnesium
Mgⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Mgⓘ CordieriteMg2Al4Si5O18
Mgⓘ EnstatiteMg2Si2O6
Mgⓘ ForsteriteMg2(SiO4)
Mgⓘ LizarditeMg3(Si2O5)(OH)4
Mgⓘ VermiculiteMg0.7(Mg,Fe,Al)6(Si,Al)8O20(OH)4 · 8H2O
AlAluminium
Alⓘ AlbiteNa(AlSi3O8)
Alⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Alⓘ CordieriteMg2Al4Si5O18
Alⓘ ElbaiteNa(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH)
Alⓘ Foitite◻(Fe22+Al)Al6(Si6O18)(BO3)3(OH)3(OH)
Alⓘ MuscoviteKAl2(AlSi3O10)(OH)2
Alⓘ SchorlNaFe32+Al6(Si6O18)(BO3)3(OH)3(OH)
Alⓘ SiderophylliteKFe22+Al(Al2Si2O10)(OH)2
Alⓘ VermiculiteMg0.7(Mg,Fe,Al)6(Si,Al)8O20(OH)4 · 8H2O
Alⓘ Plagioclase(Na,Ca)[(Si,Al)AlSi2]O8
SiSilicon
Siⓘ AlbiteNa(AlSi3O8)
Siⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Siⓘ CordieriteMg2Al4Si5O18
Siⓘ ElbaiteNa(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH)
Siⓘ EnstatiteMg2Si2O6
Siⓘ Foitite◻(Fe22+Al)Al6(Si6O18)(BO3)3(OH)3(OH)
Siⓘ ForsteriteMg2(SiO4)
Siⓘ LizarditeMg3(Si2O5)(OH)4
Siⓘ MuscoviteKAl2(AlSi3O10)(OH)2
Siⓘ QuartzSiO2
Siⓘ SchorlNaFe32+Al6(Si6O18)(BO3)3(OH)3(OH)
Siⓘ SiderophylliteKFe22+Al(Al2Si2O10)(OH)2
Siⓘ VermiculiteMg0.7(Mg,Fe,Al)6(Si,Al)8O20(OH)4 · 8H2O
Siⓘ Plagioclase(Na,Ca)[(Si,Al)AlSi2]O8
Siⓘ Serpentine SubgroupD3[Si2O5](OH)4
KPotassium
Kⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Kⓘ MuscoviteKAl2(AlSi3O10)(OH)2
Kⓘ SiderophylliteKFe22+Al(Al2Si2O10)(OH)2
CaCalcium
Caⓘ Plagioclase(Na,Ca)[(Si,Al)AlSi2]O8
TiTitanium
Tiⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
FeIron
Feⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Feⓘ Foitite◻(Fe22+Al)Al6(Si6O18)(BO3)3(OH)3(OH)
Feⓘ SchorlNaFe32+Al6(Si6O18)(BO3)3(OH)3(OH)
Feⓘ SiderophylliteKFe22+Al(Al2Si2O10)(OH)2
Feⓘ VermiculiteMg0.7(Mg,Fe,Al)6(Si,Al)8O20(OH)4 · 8H2O

Other Regions, Features and Areas containing this locality

AfricaContinent
African Plate
Eurasian PlateTectonic Plate
Morocco
  • RifMountain Range
Northwest Africa MeteoritesGroup of Meteorite Fall Locations

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

[1]Giannoni, M.; Dini, A.; Bonechi, M.; Pezzotta, F. (2025) Antsirabe, Madagascar 14th to 18th of July, 2025 - Miocene LCT and tourmaline-bearing pegmatites of Amter (Chefchaouen, Morocco): structural, textural and mineralogical insights. p.45-46.
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