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Catugi (Três Barras), Padre Paraíso, Minas Gerais, Brazili
Regional Level Types
Catugi (Três Barras)- not defined -
Padre Paraíso- not defined -
Minas Gerais- not defined -
BrazilCountry

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Key
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Location is approximate, estimate based on other nearby localities.
 
Latitude & Longitude (WGS84): 17° South , 41° West (est.)
Margin of Error:~21km
Köppen climate type:Aw : Tropical savanna, wet


Tres Barras was the old name of the actual Catugi township, Minas Gerais; the correct would be to write is as Catugi ("Tres Barras"), but as there are probably many specimens in collections all over the world labelled as from "Tres Barras" it would be easier to find the reference of the locality written as above.

Most of the production of aquamarine and topaz from Tres Barras came from eluvial and colluvial deposits; the original matrix was narrow pegmatites that were eroded; almost all of these deposits have already been mined out.

Some attempts have been made to dig inside primary pegmatites, but they are normally narrow and the eventual production of aquamarine/topaz is very erratic; no names have been given to the tunnels opened inside these narrow veins.

Regions containing this locality

South America PlateTectonic Plate
South AmericaContinent

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List


2 valid minerals.

Detailed Mineral List:

Beryl
Formula: Be3Al2(Si6O18)
Reference: Proctor, Keith: Gem Pegmatites of Minas Gerais, Brazil: Exploration, Occurrence and Aquamarine Deposits, Gems and Gemology, Summer 1984, pp 78-100
Beryl var: Aquamarine
Formula: Be3Al2Si6O18
Beryl var: Heliodor
Formula: Be3Al2(Si6O18)
Reference: John Stolz collection
Topaz
Formula: Al2(SiO4)(F,OH)2

List of minerals arranged by Strunz 10th Edition classification

Group 9 - Silicates
Beryl9.CJ.05Be3Al2(Si6O18)
var: Aquamarine9.CJ.05Be3Al2Si6O18
var: Heliodor9.CJ.05Be3Al2(Si6O18)
Topaz9.AF.35Al2(SiO4)(F,OH)2

List of minerals arranged by Dana 8th Edition classification

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)
Unclassified Minerals, Mixtures, etc.
var: Aquamarine-Be3Al2Si6O18
var: Heliodor-Be3Al2(Si6O18)

List of minerals for each chemical element

HHydrogen
H TopazAl2(SiO4)(F,OH)2
BeBeryllium
Be Beryl (var: Aquamarine)Be3Al2Si6O18
Be BerylBe3Al2(Si6O18)
Be Beryl (var: Heliodor)Be3Al2(Si6O18)
OOxygen
O TopazAl2(SiO4)(F,OH)2
O Beryl (var: Aquamarine)Be3Al2Si6O18
O BerylBe3Al2(Si6O18)
O Beryl (var: Heliodor)Be3Al2(Si6O18)
FFluorine
F TopazAl2(SiO4)(F,OH)2
AlAluminium
Al TopazAl2(SiO4)(F,OH)2
Al Beryl (var: Aquamarine)Be3Al2Si6O18
Al BerylBe3Al2(Si6O18)
Al Beryl (var: Heliodor)Be3Al2(Si6O18)
SiSilicon
Si TopazAl2(SiO4)(F,OH)2
Si Beryl (var: Aquamarine)Be3Al2Si6O18
Si BerylBe3Al2(Si6O18)
Si Beryl (var: Heliodor)Be3Al2(Si6O18)

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