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Andrade mine, João Monlevade, Minas Gerais, Brazili
Regional Level Types
Andrade mineMine
João MonlevadeMunicipality
Minas GeraisState
BrazilCountry

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Key
05269870014951454176039.jpg
Andrrade iron mine, showing hematite layers

Andrade mine, João Monlevade, Minas Gerais, Brazil
07007900014948766912672.jpg
Andrrade iron mine showing banding in hematite

Andrade mine, João Monlevade, Minas Gerais, Brazil
08498980014950327761063.jpg
Andrrade iron mine, showing hematite layers

Andrade mine, João Monlevade, Minas Gerais, Brazil
07007900014948766912672.jpg
Andrrade iron mine showing banding in hematite

Andrade mine, João Monlevade, Minas Gerais, Brazil
Latitude & Longitude (WGS84):
19° 47' 20'' South , 43° 11' 8'' West
Latitude & Longitude (decimal):
Locality type:
Nearest Settlements:
PlacePopulationDistance
João Monlevade72,762 (2012)2.7km
Rio Piracicaba10,439 (2012)15.6km
Nova Era15,595 (2012)16.1km
Itabira99,496 (2012)19.3km
São Domingos do Prata9,466 (2012)24.3km
Owned/operated by:
Name(s) in local language(s):
Mina do Andrade


A large open pit iron mine where the main ore is Hematite. In this mine was a vein/layer of fine-grained specular hematite that in addition to sparkling in the sun, was iridescent. The iridescence caused by a nanoscale phosphate mineral upon which a fair amount of work was done to determine what it was. It is apparently a new mineral nicely oriented on the surface of the tiny hematite crystals, but because of its size, it has not been granted new species status by the IMA.

A container load (about 15 tons) of the iridescent material was collected and imported into the United States and distributed to many different mineral dealers. The material was mostly confined to one dealer and the locality that was given out for the fine was Belo Horizonte. No more accurate information was given out at the time to protect the commercial interests of a number of individuals and to keep the mine from being inundated by people wanting to get some of the material. Many years have passed and the dealer (Rock Currier) feels that it is time that the detailed locality should be set forth for posterity sake. This was a one-time occurrence, not because the material was exhausted in the mine, but because the mining of this small amount of material disrupted the mining plan of the mine and management decided that a small sale like this one was not worth their time and effort. As an interesting aside, the mining company on occasion would scoop up a truckload or two of this colorful material and scatter it on the streets of a local small town on the occasion of a particular festival. Much to the importers' amazement, the material was also used in fashion jewelry. The importer never thought of it in terms of being anything other than "color rock". (Rock Currier, 2010)

The deposit was worked already in the early 19th century, and for some time also produced gold, minor quantities of which are contained in the iron ore.

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Commodity List

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


Mineral List


4 valid minerals.

Detailed Mineral List:

Gold
Formula: Au
Reference: Henwood, W.J. (1871): Transactions of the Royal Geological Society of Cornwall 8(1), 168-370
Hematite
Formula: Fe2O3
Reference: Collected in the mine and a visual identification indicated that it was hematite [Rock Currier 2010]; GEONOMOS, 4 (1): 61-75 UM MODELO PARA A EVOLUÇÃO MICROESTRUTURAL DOS MINÉRIOS DE FERRO DO QUADRILÁTERO FERRÍFERO. PARTE II - TRAMA, TEXTURA E ANISOTROPIA DE SUSCEPTIBILIDADE MAGNÉTICA
Hematite var: Martite
Formula: Fe2O3
Reference: GEONOMOS, 4 (1): 61-75 UM MODELO PARA A EVOLUÇÃO MICROESTRUTURAL DOS MINÉRIOS DE FERRO DO QUADRILÁTERO FERRÍFERO. PARTE II - TRAMA, TEXTURA E ANISOTROPIA DE SUSCEPTIBILIDADE MAGNÉTICA
Hematite var: Specularite
Formula: Fe2O3
Reference: Henwood, W.J. (1871): Transactions of the Royal Geological Society of Cornwall 8(1), 168-370
Magnetite
Formula: Fe2+Fe3+2O4
Reference: GEONOMOS, 4 (1): 61-75 UM MODELO PARA A EVOLUÇÃO MICROESTRUTURAL DOS MINÉRIOS DE FERRO DO QUADRILÁTERO FERRÍFERO. PARTE II - TRAMA, TEXTURA E ANISOTROPIA DE SUSCEPTIBILIDADE MAGNÉTICA
'Manganese Oxides'
Reference: Henwood, W.J. (1871): Transactions of the Royal Geological Society of Cornwall 8(1), 168-370
Quartz
Formula: SiO2
Reference: Henwood, W.J. (1871): Transactions of the Royal Geological Society of Cornwall 8(1), 168-370

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
Gold1.AA.05Au
Group 4 - Oxides and Hydroxides
Hematite4.CB.05Fe2O3
var: Martite4.CB.05Fe2O3
var: Specularite4.CB.05Fe2O3
Magnetite4.BB.05Fe2+Fe3+2O4
Quartz4.DA.05SiO2
Unclassified Minerals, Rocks, etc.
'Manganese Oxides'-

List of minerals arranged by Dana 8th Edition classification

Group 1 - NATIVE ELEMENTS AND ALLOYS
Metals, other than the Platinum Group
Gold1.1.1.1Au
Group 4 - SIMPLE OXIDES
A2X3
Hematite4.3.1.2Fe2O3
Group 7 - MULTIPLE OXIDES
AB2X4
Magnetite7.2.2.3Fe2+Fe3+2O4
Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si
Quartz75.1.3.1SiO2
Unclassified Minerals, Mixtures, etc.
Hematite
var: Martite
-Fe2O3
var: Specularite-Fe2O3
'Manganese Oxides'-

List of minerals for each chemical element

OOxygen
O HematiteFe2O3
O Hematite (var: Martite)Fe2O3
O MagnetiteFe2+Fe23+O4
O Hematite (var: Specularite)Fe2O3
O QuartzSiO2
SiSilicon
Si QuartzSiO2
FeIron
Fe HematiteFe2O3
Fe Hematite (var: Martite)Fe2O3
Fe MagnetiteFe2+Fe23+O4
Fe Hematite (var: Specularite)Fe2O3
AuGold
Au GoldAu

References

Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Henwood, W.J. (1871) Observations on Metalliferous Deposits: On the Gold Mines of Minas Geraes, in Brazil. Transactions of the Royal Geological Society of Cornwall, 8(1), 168-370.
George Rossman (California Institute of Technology), personal communication (Rock Currier, 2010).
Lin, X., Heaney, P.J., and Post, J.E. (2018) Iridescence in metamorphic “rainbow” hematite. Gems & Gemology, 54(1) (Spring 2018), 28-39.

Mindat Articles

A story about color rock by Rock Currier


Other Regions, Features and Areas containing this locality

Brazil
South AmericaContinent
South America PlateTectonic Plate

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