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Pedra Azul pegmatite district, Minas Gerais, Brazili
Regional Level Types
Pedra Azul pegmatite districtDistrict
Minas GeraisState
BrazilCountry

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Key
Locality type:
Largest Settlements:
PlacePopulation
Pedra Azul20,899 (2012)
Medina14,686 (2012)
Other/historical names associated with this locality:
Fortaleza


Pegmatite that is known for aquamarine of very high quality, like "Fortaleza Aqua".

"Pegmatite bodies from this district are internal to proximal (marginal) source granite; they are generally small to medium (up to 5 m thick) and homogeneous, biotite-rich and tourmaline-poor or -free; lithium minerals are also absent. Deposits from that area aim the extraction of gemologic beryl and topaz; green and yellow fluorapatite is a common accessory mineral in the replacement bodies." (Menezes Filho et al., 2016).

Note: Pedra Azul is Portuguese for "blue stone".

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List

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

11 valid minerals.

Rock Types Recorded

Note: this is a very new system on mindat.org and data is currently VERY limited. Please bear with us while we work towards adding this information!

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

Select Rock List Type

Alphabetical List Tree Diagram

Detailed Mineral List:

Albite
Formula: Na(AlSi3O8)
Beryl
Formula: Be3Al2(Si6O18)
Beryl var: Alkali-beryl
Formula: Be3Al2(Si6O18)
Reference: Revista Brasileira de Geociências 31(l):89-94
Beryl var: Aquamarine
Formula: Be3Al2Si6O18
Beryl var: Heliodor
Formula: Be3Al2(Si6O18)
Reference: No reference listed
'Biotite'
Formula: K(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
Reference: Luiz Alberto Dias Menezes Filho, Mario Luiz de Sá Carneiro Chaves, Coralie Heinis Dias, Daniel Atencio (2016): Recent mineral discoveries in the Coronel Murta, Taquaral, and Medina pegmatite fields, northeastern Minas Gerais, Brazil. REM - Int. Eng. J. 69, 301-307. [http://www.scielo.br/pdf/remi/v69n3/2448-167X-remi-69-03-0301.pdf]
'Feldspar Group'
Reference: Carlos Barbosa specimen
'Feldspar Group var: Perthite'
Reference: Carlos Barbosa specimen
Fluorapatite
Formula: Ca5(PO4)3F
Reference: Luis Menezes
Fluorite
Formula: CaF2
Reference: Sergio Varvello collection
Herderite
Formula: CaBePO4(F,OH)
Microcline
Formula: K(AlSi3O8)
Muscovite
Formula: KAl2(AlSi3O10)(OH)2
Phenakite
Formula: Be2SiO4
Quartz
Formula: SiO2
Schorl
Formula: Na(Fe2+3)Al6(Si6O18)(BO3)3(OH)3(OH)
Topaz
Formula: Al2(SiO4)(F,OH)2

List of minerals arranged by Strunz 10th Edition classification

Group 3 - Halides
Fluorite3.AB.25CaF2
Group 4 - Oxides and Hydroxides
Quartz4.DA.05SiO2
Group 8 - Phosphates, Arsenates and Vanadates
Fluorapatite8.BN.05Ca5(PO4)3F
Herderite8.BA.10CaBePO4(F,OH)
Group 9 - Silicates
Albite9.FA.35Na(AlSi3O8)
Beryl9.CJ.05Be3Al2(Si6O18)
var: Alkali-beryl9.CJ.05Be3Al2(Si6O18)
var: Aquamarine9.CJ.05Be3Al2Si6O18
var: Heliodor9.CJ.05Be3Al2(Si6O18)
Microcline9.FA.30K(AlSi3O8)
Muscovite9.EC.15KAl2(AlSi3O10)(OH)2
Phenakite9.AA.05Be2SiO4
Schorl9.CK.05Na(Fe2+3)Al6(Si6O18)(BO3)3(OH)3(OH)
Topaz9.AF.35Al2(SiO4)(F,OH)2
Unclassified Minerals, Rocks, etc.
'Biotite'-K(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
'Feldspar Group'-
'var: Perthite'-

List of minerals arranged by Dana 8th Edition classification

Group 9 - NORMAL HALIDES
AX2
Fluorite9.2.1.1CaF2
Group 41 - ANHYDROUS PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
(AB)2(XO4)Zq
Herderite41.5.4.1CaBePO4(F,OH)
A5(XO4)3Zq
Fluorapatite41.8.1.1Ca5(PO4)3F
Group 51 - NESOSILICATES Insular SiO4 Groups Only
Insular SiO4 Groups Only with cations in [4] coordination
Phenakite51.1.1.1Be2SiO4
Group 52 - NESOSILICATES Insular SiO4 Groups and O,OH,F,H2O
Insular SiO4 Groups and O, OH, F, and H2O with cations in [6] coordination only
Topaz52.3.1.1Al2(SiO4)(F,OH)2
Group 61 - CYCLOSILICATES Six-Membered Rings
Six-Membered Rings with [Si6O18] rings; possible (OH) and Al substitution
Beryl61.1.1.1Be3Al2(Si6O18)
Six-Membered Rings with borate groups
Schorl61.3.1.10Na(Fe2+3)Al6(Si6O18)(BO3)3(OH)3(OH)
Group 71 - PHYLLOSILICATES Sheets of Six-Membered Rings
Sheets of 6-membered rings with 2:1 layers
Muscovite71.2.2a.1KAl2(AlSi3O10)(OH)2
Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si
Quartz75.1.3.1SiO2
Group 76 - TECTOSILICATES Al-Si Framework
Al-Si Framework with Al-Si frameworks
Albite76.1.3.1Na(AlSi3O8)
Microcline76.1.1.5K(AlSi3O8)
Unclassified Minerals, Mixtures, etc.
Beryl
var: Alkali-beryl
-Be3Al2(Si6O18)
var: Aquamarine-Be3Al2Si6O18
var: Heliodor-Be3Al2(Si6O18)
'Biotite'-K(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
'Feldspar Group'-
'var: Perthite'-

List of minerals for each chemical element

HHydrogen
H MuscoviteKAl2(AlSi3O10)(OH)2
H TopazAl2(SiO4)(F,OH)2
H SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
H BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
BeBeryllium
Be BerylBe3Al2(Si6O18)
Be Beryl (var: Aquamarine)Be3Al2Si6O18
Be HerderiteCaBePO4(F,OH)
Be Beryl (var: Heliodor)Be3Al2(Si6O18)
Be PhenakiteBe2SiO4
Be Beryl (var: Alkali-beryl)Be3Al2(Si6O18)
BBoron
B SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
OOxygen
O MuscoviteKAl2(AlSi3O10)(OH)2
O TopazAl2(SiO4)(F,OH)2
O SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
O BerylBe3Al2(Si6O18)
O Beryl (var: Aquamarine)Be3Al2Si6O18
O MicroclineK(AlSi3O8)
O QuartzSiO2
O AlbiteNa(AlSi3O8)
O HerderiteCaBePO4(F,OH)
O BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
O Beryl (var: Heliodor)Be3Al2(Si6O18)
O FluorapatiteCa5(PO4)3F
O PhenakiteBe2SiO4
O Beryl (var: Alkali-beryl)Be3Al2(Si6O18)
FFluorine
F TopazAl2(SiO4)(F,OH)2
F HerderiteCaBePO4(F,OH)
F BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
F FluorapatiteCa5(PO4)3F
F FluoriteCaF2
NaSodium
Na SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
Na AlbiteNa(AlSi3O8)
MgMagnesium
Mg BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
AlAluminium
Al MuscoviteKAl2(AlSi3O10)(OH)2
Al TopazAl2(SiO4)(F,OH)2
Al SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
Al BerylBe3Al2(Si6O18)
Al Beryl (var: Aquamarine)Be3Al2Si6O18
Al MicroclineK(AlSi3O8)
Al AlbiteNa(AlSi3O8)
Al BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
Al Beryl (var: Heliodor)Be3Al2(Si6O18)
Al Beryl (var: Alkali-beryl)Be3Al2(Si6O18)
SiSilicon
Si MuscoviteKAl2(AlSi3O10)(OH)2
Si TopazAl2(SiO4)(F,OH)2
Si SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
Si BerylBe3Al2(Si6O18)
Si Beryl (var: Aquamarine)Be3Al2Si6O18
Si MicroclineK(AlSi3O8)
Si QuartzSiO2
Si AlbiteNa(AlSi3O8)
Si BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
Si Beryl (var: Heliodor)Be3Al2(Si6O18)
Si PhenakiteBe2SiO4
Si Beryl (var: Alkali-beryl)Be3Al2(Si6O18)
PPhosphorus
P HerderiteCaBePO4(F,OH)
P FluorapatiteCa5(PO4)3F
KPotassium
K MuscoviteKAl2(AlSi3O10)(OH)2
K MicroclineK(AlSi3O8)
K BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
CaCalcium
Ca HerderiteCaBePO4(F,OH)
Ca FluorapatiteCa5(PO4)3F
Ca FluoriteCaF2
FeIron
Fe SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
Fe BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2

References

Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Gübelin, E. and Wolgensinger, M. (1976) Edelstenen. Uitgeverij Artis, Brussel (in Dutch).
Sauer, J.R. (1982) Brazil, Paradise of Gemstones. Gemological Institute of America, 135 pp. (p. 28).

External Links

Luiz Alberto Dias Menezes Filho, Mario Luiz de Sá Carneiro Chaves, Coralie Heinis Dias, Daniel Atencio (2016): Recent mineral discoveries in the Coronel Murta, Taquaral, and Medina pegmatite fields, northeastern Minas Gerais, Brazil. REM - Int. Eng. J. 69, 301-307. [http://www.scielo.br/pdf/remi/v69n3/2448-167X-remi-69-03-0301.pdf]

Localities in this Region

Other Regions, Features and Areas that Intersect

Brazil
South America PlateTectonic Plate

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