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Coromandel district, Minas Gerais, Brazili
Regional Level Types
Coromandel districtDistrict
Minas Gerais- not defined -
BrazilCountry

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Area along the St. Inácio River extensively quarried for alluvial diamonds

Santo Inácio River valley, Coromandel, Coromandel district, Minas Gerais, Brazil
Terrain quarried for alluvial diamonds with apparent dredging barge on water

Bagagem River valley, Coromandel district, Minas Gerais, Brazil
View of the Bagagem diamond mining area, ca. 1930.

Bagagem River valley, Coromandel district, Minas Gerais, Brazil
View of the Bagagem diamond mining area, ca. 1930.

Bagagem River valley, Coromandel district, Minas Gerais, Brazil
Area along the St. Inácio River extensively quarried for alluvial diamonds

Santo Inácio River valley, Coromandel, Coromandel district, Minas Gerais, Brazil
Terrain quarried for alluvial diamonds with apparent dredging barge on water

Bagagem River valley, Coromandel district, Minas Gerais, Brazil
View of the Bagagem diamond mining area, ca. 1930.

Bagagem River valley, Coromandel district, Minas Gerais, Brazil
View of the Bagagem diamond mining area, ca. 1930.

Bagagem River valley, Coromandel district, Minas Gerais, Brazil
Area along the St. Inácio River extensively quarried for alluvial diamonds

Santo Inácio River valley, Coromandel, Coromandel district, Minas Gerais, Brazil
Terrain quarried for alluvial diamonds with apparent dredging barge on water

Bagagem River valley, Coromandel district, Minas Gerais, Brazil


Coromandel is primarily an agricultural center in western Minas Gerais state, but local miners and small companies have long processed lateritic soils and alluvium in stream valleys for diamonds in an area within about 80 km of the city. This area has been known as the Coromandel diamond district since early in its history. The city of Coromandel is near the geographic center of the district. Coromandel had become the principal hub of the diamond trade in western Minas Gerais in the 1700's, but the city of Franca in São Paulo state has since taken the top ranking because of its better-developed infrastructure and proximity to the major industrial city of São Paulo.

Only those streams in the Coromandel district and surrounding areas that dissect uplands formed on Upper Cretaceous sedimentary and pyroclastic strata have proven to be prospective for diamonds, suggesting that the Cretaceous beds are the source for the diamonds. Interestingly, 98% of diamonds mined in Minas Gerais were produced from alluvial deposits of modern streams, and the remaining 2% are from Neoproterozoic conglomerates (Chaves et al., 1993). Karfunkel et al. (1994) estimated that 40 million carats (plus or minus 10 million) of diamonds have been recovered from alluvial deposits in the Coromandel district since its discovery roughly 275 years ago. In 1993, however, total production for the entire year from all of western Minas Gerais had dropped to only 20,000 carats. The largest diamond ever found in Brazil, the "Presidente Vargas," weighing 726.6 carats, was discovered in 1938 along the St. Antônio do Bonito River within the Coromandel district. That river has been especially rich, as the second (460 ct.), fifth (400.5 ct.), and sixth (377.5 ct.) largest diamonds were also found in its gravels, as well as another five diamonds larger than 100 carats.

In fact, all natural diamonds from the Earth originated in the upper mantle, finding their way to the surface as a result of explosive eruptions of alkali-rich ultramafic rocks such as kimberlite. Those rock types have been found throughout the Coromandel district and beyond, and the region where they occur has been named “Alto Paranaíba Igneous Province” (also referred to as the “Alto Paranaíba Diamondiferous Province” by some authors). These ultramafics were intruded and extruded in this region during the Late Cretaceous, mostly in the interval 98-75 Ma. Numerous diatremes and pipes of kimberlite and flows and pyroclasic deposits of kamafugite have been found in the Alto Paranaíba Igneous Province. They have produced few gem-quality diamonds, however. Nevertheless, conglomerates interbedded with the kamafugitic flows and pyroclastics do contain scarce diamonds. They are common enough locally in lithified Cretaceous conglomerates to have been mined, specifically in the Romaria district and from an upland site in the Coromandel district between the St. Inácio and St. Antônio do Bonito Rivers (Karfunkel et al., 2014).

So many diamonds have been found in alluvial gravels in the diamond districts of the Alto Paranaíba province that there must have been at least one, and possibly several, primary kimberlite sources in the province. Unfortunately, surficial portions of pipes, diatremes, and volcanic cones throughout the province have been intensively weathered in the subtropical climate, creating up to tens of meters of lateritic soils and obscuring surficial indications of where such diamond-bearing features may have been. Difficulty in finding diamonds in-place in the kimberlites suggests they are/were very scarce in those sources to begin with, or were present in only a few of them. Most diamonds found in the province had been reworked from primary sources (kimberlites and related rocks) into secondary deposits including the conglomerates and surficial deposits of Late Cretaceous to Quaternary age. Other states in Brazil have also produced diamonds from Neoproterozoic and younger conglomerates, as well as modern stream gravels.

Processes of weathering followed by runoff and stream action with attendant sorting and abrasion likely worked to decrease the volume of conglomerate matrix in which the diamonds were embedded. Susceptible materials would have been fragmented, replaced by clays and other secondary minerals, and transported away along with particles up to silt size including the smallest diamonds. The coarser and more chemically-resistant fraction, including diamonds of economic value, were deposited in stream alluvium that formed conglomerates during the Cretaceous. Today these conglomerates defend the broad plateau surfaces of highlands referred to as "chapadas." Diamondiferous gravels and conglomerates deposited on the hillsides are younger, and represent an intermediate stage in the reworking process (see Andrade and Chaves, 2009). Modern stream gavels are younger yet, and may contain diamonds that were eroded and redeposited more than once. At each step, processes of weathering, erosion, and transportation further concentrated the diamonds. Even after two or more episodes of this natural “high-grading,” however, diamond concentrations in stream gravels average only about 0.07 carat/m3. They fall within a sieve size range of 1.41 to 2.0 mm in the Romaria district (Karfunkel et al., 1994). Such values are not economic for any mining operations except those by garimpeiros. These economic conditions are enough to account for the fact that none of the major diamond companies that examined this region invested in establishment of large-scale diamond-mining operations.

NK, December 2016, updated June 2017

Regions containing this locality

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Standard Detailed Strunz Dana Chemical Elements

Mineral List

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

25 valid minerals.

Detailed Mineral List:

'Albite-Anorthite Series'
Reference: Fernandes, A. G., Karfunkel, J., Hoover, D. B., Sgarbi, P. B. de A., Sgarbi, G. N. C., Oliveira, G. D., Gomes, J. C. de S. P., and Kambrock, K., 2014, The basal conglomerate of the Capacete Formation (Mata da Corda Group) and its relation to diamond distributions in Coromandel, Minas Gerais state, Brazil: Brazilian Jour. of Geology, v. 44, no. 1, p. 91-103.
Almandine
Formula: Fe2+3Al2(SiO4)3
Reference: Chaves, M. L. S. C., and Svisero, D. P., 1993, Características geológicas e origem conglomerados diamantíferos das regiões de Diamantina (Mesoproterozóico) e de Romaria (Cretáceo Superior), Minas Gerais: Boletim Instituto Geociências, Univ.São Paulo, Séries Cient., v. 24, p. 49-57.
Anatase
Formula: TiO2
Reference: Chaves, M. L. S. C., and Svisero, D. P., 1993, Características geológicas e origem conglomerados diamantíferos das regiões de Diamantina (Mesoproterozóico) e de Romaria (Cretáceo Superior), Minas Gerais: Boletim Instituto Geociências, Univ.São Paulo, Séries Cient., v. 24, p. 49-57.
Baryte
Formula: BaSO4
Reference: Andrade, K. E., and Chaves, M. L. S. C., 2009, Geologia e a redistribuição sedimentary pós-Cretácica dos depósitos diamantíferos da região ao sul fe Coromandel (MG): Geonomos, v. 17, no. 1, p. 27-36.
Calcite
Formula: CaCO3
Reference: Andrade, K. E., and Chaves, M. L. S. C., 2009, Geologia e a redistribuição sedimentary pós-Cretácica dos depósitos diamantíferos da região ao sul fe Coromandel (MG): Geonomos, v. 17, no. 1, p. 27-36.
Diamond
Formula: C
Localities: Reported from at least 10 localities in this region.
Epidote
Formula: {Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Reference: Chaves, M. L. S. C., and Svisero, D. P., 1993, Características geológicas e origem conglomerados diamantíferos das regiões de Diamantina (Mesoproterozóico) e de Romaria (Cretáceo Superior), Minas Gerais: Boletim Instituto Geociências, Univ.São Paulo, Séries Cient., v. 24, p. 49-57.
'Fayalite-Forsterite Series'
Reference: Andrade, K. E., and Chaves, M. L. S. C., 2009, Geologia e a redistribuição sedimentary pós-Cretácica dos depósitos diamantíferos da região ao sul fe Coromandel (MG): Geonomos, v. 17, no. 1, p. 27-36.
'Garnet Group'
Formula: X3Z2(SiO4)3
Goethite
Formula: α-Fe3+O(OH)
Reference: Chaves, M. L. S. C., and Svisero, D. P., 1993, Características geológicas e origem conglomerados diamantíferos das regiões de Diamantina (Mesoproterozóico) e de Romaria (Cretáceo Superior), Minas Gerais: Boletim Instituto Geociências, Univ.São Paulo, Séries Cient., v. 24, p. 49-57.
Gorceixite
Formula: BaAl3(PO4)(PO3OH)(OH)6
Grossular
Formula: Ca3Al2(SiO4)3
Reference: Chaves, M. L. S. C., and Svisero, D. P., 1993, Características geológicas e origem conglomerados diamantíferos das regiões de Diamantina (Mesoproterozóico) e de Romaria (Cretáceo Superior), Minas Gerais: Boletim Instituto Geociências, Univ.São Paulo, Séries Cient., v. 24, p. 49-57.
Hematite
Formula: Fe2O3
Ilmenite
Formula: Fe2+TiO3
Kaolinite
Formula: Al2(Si2O5)(OH)4
Reference: Chaves, M. L. S. C., and Svisero, D. P., 1993, Características geológicas e origem conglomerados diamantíferos das regiões de Diamantina (Mesoproterozóico) e de Romaria (Cretáceo Superior), Minas Gerais: Boletim Instituto Geociências, Univ.São Paulo, Séries Cient., v. 24, p. 49-57.
Kyanite
Formula: Al2(SiO4)O
Reference: Chaves, M. L. S. C., and Svisero, D. P., 1993, Características geológicas e origem conglomerados diamantíferos das regiões de Diamantina (Mesoproterozóico) e de Romaria (Cretáceo Superior), Minas Gerais: Boletim Instituto Geociências, Univ.São Paulo, Séries Cient., v. 24, p. 49-57.
Magnetite
Formula: Fe2+Fe3+2O4
Microcline
Formula: K(AlSi3O8)
Reference: Fernandes, A. G., Karfunkel, J., Hoover, D. B., Sgarbi, P. B. de A., Sgarbi, G. N. C., Oliveira, G. D., Gomes, J. C. de S. P., and Kambrock, K., 2014, The basal conglomerate of the Capacete Formation (Mata da Corda Group) and its relation to diamond distributions in Coromandel, Minas Gerais state, Brazil: Brazilian Jour. of Geology, v. 44, no. 1, p. 91-103.
'Monazite'
Reference: Chaves, M. L. S. C., and Svisero, D. P., 1993, Características geológicas e origem conglomerados diamantíferos das regiões de Diamantina (Mesoproterozóico) e de Romaria (Cretáceo Superior), Minas Gerais: Boletim Instituto Geociências, Univ.São Paulo, Séries Cient., v. 24, p. 49-57.
Muscovite
Formula: KAl2(AlSi3O10)(OH)2
Reference: Chaves, M. L. S. C., and Svisero, D. P., 1993, Características geológicas e origem conglomerados diamantíferos das regiões de Diamantina (Mesoproterozóico) e de Romaria (Cretáceo Superior), Minas Gerais: Boletim Instituto Geociências, Univ.São Paulo, Séries Cient., v. 24, p. 49-57.
Muscovite var: Illite
Formula: K0.65Al2.0[Al0.65Si3.35O10](OH)2
Reference: Chaves, M. L. S. C., and Svisero, D. P., 1993, Características geológicas e origem conglomerados diamantíferos das regiões de Diamantina (Mesoproterozóico) e de Romaria (Cretáceo Superior), Minas Gerais: Boletim Instituto Geociências, Univ.São Paulo, Séries Cient., v. 24, p. 49-57.
Opal
Formula: SiO2 · nH2O
Reference: Chaves, M. L. S. C., and Svisero, D. P., 1993, Características geológicas e origem conglomerados diamantíferos das regiões de Diamantina (Mesoproterozóico) e de Romaria (Cretáceo Superior), Minas Gerais: Boletim Instituto Geociências, Univ.São Paulo, Séries Cient., v. 24, p. 49-57.
Perovskite
Formula: CaTiO3
Phlogopite
Formula: KMg3(AlSi3O10)(OH)2
Reference: Fernandes, A. G., Karfunkel, J., Hoover, D. B., Sgarbi, P. B. de A., Sgarbi, G. N. C., Oliveira, G. D., Gomes, J. C. de S. P., and Kambrock, K., 2014, The basal conglomerate of the Capacete Formation (Mata da Corda Group) and its relation to diamond distributions in Coromandel, Minas Gerais state, Brazil: Brazilian Jour. of Geology, v. 44, no. 1, p. 91-103.
Pyrite
Formula: FeS2
Reference: Fernandes, A. G., Karfunkel, J., Hoover, D. B., Sgarbi, P. B. de A., Sgarbi, G. N. C., Oliveira, G. D., Gomes, J. C. de S. P., and Kambrock, K, 2014, The basal conglomerate of the Capacete Formation (Mata da Corda Group) and its relation to diamond distributions in Coromandel, Minas Gerais state, Brazil: Brazilian Jour. of Geology, v. 44, no. 1, p. 91-103.
Pyrope
Formula: Mg3Al2(SiO4)3
'Pyroxene Group'
Reference: Fernandes, A. G., Karfunkel, J., Hoover, D. B., Sgarbi, P. B. de A., Sgarbi, G. N. C., Oliveira, G. D., Gomes, J. C. de S. P., and Kambrock, K., 2014, The basal conglomerate of the Capacete Formation (Mata da Corda Group) and its relation to diamond distributions in Coromandel, Minas Gerais state, Brazil: Brazilian Jour. of Geology, v. 44, no. 1, p. 91-103.
Quartz
Formula: SiO2
Rutile
Formula: TiO2
Titanite
Formula: CaTi(SiO4)O
Reference: Fernandes, A. G., Karfunkel, J., Hoover, D. B., Sgarbi, P. B. de A., Sgarbi, G. N. C., Oliveira, G. D., Gomes, J. C. de S. P., and Kambrock, K., 2014, The basal conglomerate of the Capacete Formation (Mata da Corda Group) and its relation to diamond distributions in Coromandel, Minas Gerais state, Brazil: Brazilian Jour. of Geology, v. 44, no. 1, p. 91-103.
'Tourmaline'
Formula: A(D3)G6(T6O18)(BO3)3X3Z
Reference: Chaves, M. L. S. C., and Svisero, D. P., 1993, Características geológicas e origem conglomerados diamantíferos das regiões de Diamantina (Mesoproterozóico) e de Romaria (Cretáceo Superior), Minas Gerais: Boletim Instituto Geociências, Univ.São Paulo, Séries Cient., v. 24, p. 49-57.
Zircon
Formula: Zr(SiO4)

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
Diamond1.CB.10aC
Group 2 - Sulphides and Sulfosalts
Pyrite2.EB.05aFeS2
Group 4 - Oxides and Hydroxides
Anatase4.DD.05TiO2
Goethite4.00.α-Fe3+O(OH)
Hematite4.CB.05Fe2O3
Ilmenite4.CB.05Fe2+TiO3
Magnetite4.BB.05Fe2+Fe3+2O4
Opal4.DA.10SiO2 · nH2O
Perovskite4.CC.30CaTiO3
Quartz4.DA.05SiO2
Rutile4.DB.05TiO2
Group 5 - Nitrates and Carbonates
Calcite5.AB.05CaCO3
Group 7 - Sulphates, Chromates, Molybdates and Tungstates
Baryte7.AD.35BaSO4
Group 8 - Phosphates, Arsenates and Vanadates
Gorceixite8.BL.10BaAl3(PO4)(PO3OH)(OH)6
Group 9 - Silicates
Almandine9.AD.25Fe2+3Al2(SiO4)3
Epidote9.BG.05a{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Grossular9.AD.25Ca3Al2(SiO4)3
Kaolinite9.ED.05Al2(Si2O5)(OH)4
Kyanite9.AF.15Al2(SiO4)O
Microcline9.FA.30K(AlSi3O8)
Muscovite9.EC.15KAl2(AlSi3O10)(OH)2
var: Illite9.EC.15K0.65Al2.0[Al0.65Si3.35O10](OH)2
Phlogopite9.EC.20KMg3(AlSi3O10)(OH)2
Pyrope9.AD.25Mg3Al2(SiO4)3
Titanite9.AG.15CaTi(SiO4)O
Zircon9.AD.30Zr(SiO4)
Unclassified Minerals, Rocks, etc.
'Albite-Anorthite Series'-
'Fayalite-Forsterite Series'-
'Garnet Group'-X3Z2(SiO4)3
'Monazite'-
'Pyroxene Group'-
'Tourmaline'-A(D3)G6(T6O18)(BO3)3X3Z

List of minerals arranged by Dana 8th Edition classification

Group 1 - NATIVE ELEMENTS AND ALLOYS
Semi-metals and non-metals
Diamond1.3.6.1C
Group 2 - SULFIDES
AmBnXp, with (m+n):p = 1:2
Pyrite2.12.1.1FeS2
Group 4 - SIMPLE OXIDES
A2X3
Hematite4.3.1.2Fe2O3
Ilmenite4.3.5.1Fe2+TiO3
Perovskite4.3.3.1CaTiO3
AX2
Anatase4.4.4.1TiO2
Rutile4.4.1.1TiO2
Group 6 - HYDROXIDES AND OXIDES CONTAINING HYDROXYL
XO(OH)
Goethite6.1.1.2α-Fe3+O(OH)
Group 7 - MULTIPLE OXIDES
AB2X4
Magnetite7.2.2.3Fe2+Fe3+2O4
Group 14 - ANHYDROUS NORMAL CARBONATES
A(XO3)
Calcite14.1.1.1CaCO3
Group 28 - ANHYDROUS ACID AND NORMAL SULFATES
AXO4
Baryte28.3.1.1BaSO4
Group 42 - HYDRATED PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
(AB)2(XO4)Zq·xH2O
Gorceixite42.7.3.2BaAl3(PO4)(PO3OH)(OH)6
Group 51 - NESOSILICATES Insular SiO4 Groups Only
Insular SiO4 Groups Only with cations in [6] and >[6] coordination
Almandine51.4.3a.2Fe2+3Al2(SiO4)3
Grossular51.4.3b.2Ca3Al2(SiO4)3
Pyrope51.4.3a.1Mg3Al2(SiO4)3
Insular SiO4 Groups Only with cations in >[6] coordination
Zircon51.5.2.1Zr(SiO4)
Group 52 - NESOSILICATES Insular SiO4 Groups and O,OH,F,H2O
Insular SiO4 Groups and O, OH, F, and H2O with cations in [4] and >[4] coordination
Kyanite52.2.2c.1Al2(SiO4)O
Insular SiO4 Groups and O, OH, F, and H2O with cations in [6] and/or >[6] coordination
Titanite52.4.3.1CaTi(SiO4)O
Group 58 - SOROSILICATES Insular, Mixed, Single, and Larger Tetrahedral Groups
Insular, Mixed, Single, and Larger Tetrahedral Groups with cations in [6] and higher coordination; single and double groups (n = 1, 2)
Epidote58.2.1a.7{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(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
var: Illite71.2.2d.2K0.65Al2.0[Al0.65Si3.35O10](OH)2
Phlogopite71.2.2b.1KMg3(AlSi3O10)(OH)2
Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si
Quartz75.1.3.1SiO2
Si Tetrahedral Frameworks - SiO2 with H2O and organics
Opal75.2.1.1SiO2 · nH2O
Group 76 - TECTOSILICATES Al-Si Framework
Al-Si Framework with Al-Si frameworks
Microcline76.1.1.5K(AlSi3O8)
Unclassified Minerals, Mixtures, etc.
'Albite-Anorthite Series'-
'Fayalite-Forsterite Series'-
'Garnet Group'-X3Z2(SiO4)3
Kaolinite-Al2(Si2O5)(OH)4
'Monazite'-
'Pyroxene Group'-
'Tourmaline'-A(D3)G6(T6O18)(BO3)3X3Z

List of minerals for each chemical element

HHydrogen
H GorceixiteBaAl3(PO4)(PO3OH)(OH)6
H PhlogopiteKMg3(AlSi3O10)(OH)2
H Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
H Goethiteα-Fe3+O(OH)
H Muscovite (var: Illite)K0.65Al2.0[Al0.65Si3.35O10](OH)2
H KaoliniteAl2(Si2O5)(OH)4
H OpalSiO2 · nH2O
H MuscoviteKAl2(AlSi3O10)(OH)2
BBoron
B TourmalineA(D3)G6(T6O18)(BO3)3X3Z
CCarbon
C DiamondC
C CalciteCaCO3
OOxygen
O MagnetiteFe2+Fe23+O4
O IlmeniteFe2+TiO3
O PerovskiteCaTiO3
O PyropeMg3Al2(SiO4)3
O RutileTiO2
O GorceixiteBaAl3(PO4)(PO3OH)(OH)6
O Garnet GroupX3Z2(SiO4)3
O HematiteFe2O3
O QuartzSiO2
O MicroclineK(AlSi3O8)
O PhlogopiteKMg3(AlSi3O10)(OH)2
O TitaniteCaTi(SiO4)O
O BaryteBaSO4
O CalciteCaCO3
O ZirconZr(SiO4)
O AlmandineFe32+Al2(SiO4)3
O AnataseTiO2
O Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
O Goethiteα-Fe3+O(OH)
O GrossularCa3Al2(SiO4)3
O Muscovite (var: Illite)K0.65Al2.0[Al0.65Si3.35O10](OH)2
O KaoliniteAl2(Si2O5)(OH)4
O KyaniteAl2(SiO4)O
O OpalSiO2 · nH2O
O TourmalineA(D3)G6(T6O18)(BO3)3X3Z
O MuscoviteKAl2(AlSi3O10)(OH)2
MgMagnesium
Mg PyropeMg3Al2(SiO4)3
Mg PhlogopiteKMg3(AlSi3O10)(OH)2
AlAluminium
Al PyropeMg3Al2(SiO4)3
Al GorceixiteBaAl3(PO4)(PO3OH)(OH)6
Al MicroclineK(AlSi3O8)
Al PhlogopiteKMg3(AlSi3O10)(OH)2
Al AlmandineFe32+Al2(SiO4)3
Al Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Al GrossularCa3Al2(SiO4)3
Al Muscovite (var: Illite)K0.65Al2.0[Al0.65Si3.35O10](OH)2
Al KaoliniteAl2(Si2O5)(OH)4
Al KyaniteAl2(SiO4)O
Al MuscoviteKAl2(AlSi3O10)(OH)2
SiSilicon
Si PyropeMg3Al2(SiO4)3
Si Garnet GroupX3Z2(SiO4)3
Si QuartzSiO2
Si MicroclineK(AlSi3O8)
Si PhlogopiteKMg3(AlSi3O10)(OH)2
Si TitaniteCaTi(SiO4)O
Si ZirconZr(SiO4)
Si AlmandineFe32+Al2(SiO4)3
Si Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Si GrossularCa3Al2(SiO4)3
Si Muscovite (var: Illite)K0.65Al2.0[Al0.65Si3.35O10](OH)2
Si KaoliniteAl2(Si2O5)(OH)4
Si KyaniteAl2(SiO4)O
Si OpalSiO2 · nH2O
Si MuscoviteKAl2(AlSi3O10)(OH)2
PPhosphorus
P GorceixiteBaAl3(PO4)(PO3OH)(OH)6
SSulfur
S PyriteFeS2
S BaryteBaSO4
KPotassium
K MicroclineK(AlSi3O8)
K PhlogopiteKMg3(AlSi3O10)(OH)2
K Muscovite (var: Illite)K0.65Al2.0[Al0.65Si3.35O10](OH)2
K MuscoviteKAl2(AlSi3O10)(OH)2
CaCalcium
Ca PerovskiteCaTiO3
Ca TitaniteCaTi(SiO4)O
Ca CalciteCaCO3
Ca Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Ca GrossularCa3Al2(SiO4)3
TiTitanium
Ti IlmeniteFe2+TiO3
Ti PerovskiteCaTiO3
Ti RutileTiO2
Ti TitaniteCaTi(SiO4)O
Ti AnataseTiO2
FeIron
Fe MagnetiteFe2+Fe23+O4
Fe IlmeniteFe2+TiO3
Fe HematiteFe2O3
Fe PyriteFeS2
Fe AlmandineFe32+Al2(SiO4)3
Fe Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Fe Goethiteα-Fe3+O(OH)
ZrZirconium
Zr ZirconZr(SiO4)
BaBarium
Ba GorceixiteBaAl3(PO4)(PO3OH)(OH)6
Ba BaryteBaSO4

References

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Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Chaves, M. L. S. C., Dupont, H., Karfunkle, J., and Svisero, D. P. (1993): Depósitos diamantíferos de Minas Gerais: Uma revisão. Anais do I Simpósio Brasileiro de Geologia do Diamante, Cuiabá, Edição, UFMT: 79-100.
Karfunkel, J., Chaves, M. L. S. C., Svisero, D. P., and Meyer, H. O. A. (1994): Diamonds from Minas Gerais, Brazil: An update on sources, origin, and production. International Geology Review, 36:1019-1032.
Machado, I. F., and Figueirôa, S. F. de M. (2001): 500 years of mining in Brazil: a brief review. Resources Policy, 27:9-24.
Andrade, K. E., and Chaves, M. L. S. C. (2009): Geologia e a redistribuição sedimentary pós-Cretácica dos depósitos diamantíferos da região ao sul de Coromandel (MG). Geonomos, 17(1): 27-36.
Fernandes, A. G., Karfunkel, J., Hoover, D. B., Sgarbi, P. B. de A., Sgarbi, G. N. C., Oliveira, G. D., Gomes, J. C. de S. P., and Kambrock, K. (2014): The basal conglomerate of the Capacete Formation (Mata da Corda Group) and its relation to diamond distributions in Coromandel, Minas Gerais state, Brazil. Brazilian Jour. of Geology, 44(1): 91-103.
Karfunkel, J., Hoover, D., Fernandes, A. F., Sgarbi, G. N. C., Kambrock, K., and Oliveira, G. D. (2014): Diamonds from the Coromandel area, west Minas Gerais state, Brazil: an update and new data on surface sources and origin. Brazilian Journal of Geology, 44(2): 325-338.

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