Provenite

Serra das Eguas (Brumado)

AreaActiveDraft data

14.2036° S, 41.6653° W · ± 10 km

Dolomite and Emerald from Bahia, Brazil, with photos of specimens from this locality.

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Minerals found here

DolomiteEmerald

On the same specimen

Same specimen Quartz with Dolomite

1 specimen photo(s) from this locality show dolomite with quartz together. The pairing comes from the photographer's file name and label, so the relationship between the two minerals is not specified.

Same specimen Hematite with Dolomite

1 specimen photo(s) from this locality show dolomite with hematite together. The pairing comes from the photographer's file name and label, so the relationship between the two minerals is not specified.

Dolomite at Serra das Eguas (Brumado)

Gem-clear twinned dolomite crystals, sometimes intergrown with magnesite, from the magnesite deposits of the Serra das Eguas

Twinned dolomite crystal with gemmy, lustrous edges, resembling a sandwich.
Twinned dolomite crystal with gemmy, lustrous edges, resembling a sandwich.
Photo: Robert M. Lavinsky · CC BY-SA 3.0 · Source
Gem-quality twinned dolomite crystal with a visible re-entrant line.
Gem-quality twinned dolomite crystal with a visible re-entrant line.
Photo: Robert M. Lavinsky · CC BY-SA 3.0 · Source
Fine single dolomite crystal specimen from Brumado.
Fine single dolomite crystal specimen from Brumado.
Photo: Robert M. Lavinsky · CC BY-SA 3.0 · Source
Twinned dolomite crystal intergrown with a large magnesite rhomb.
Twinned dolomite crystal intergrown with a large magnesite rhomb.
Photo: Robert M. Lavinsky · CC BY-SA 3.0 · Source
Disc-shaped dolomite crystal grown against a sharp quartz crystal, both tinted rust-red by inclusions.
Disc-shaped dolomite crystal grown against a sharp quartz crystal, both tinted rust-red by inclusions.
Photo: Robert M. Lavinsky · CC BY-SA 3.0 · Source
Formula
CaMg(CO₃)₂
Morphology
Gemmy rhombohedral crystals, commonly twinned, sometimes intergrown with magnesite rhombs
Typical size
Crystals typically 1-5 cm
Color / luster
Colourless to amber, sometimes rust-tinted by hematite inclusions; glassy
Associated minerals
Magnesitequartzhematitephengite
Twins
Twins common, including notched sandwich-like and triangular forms

Sources: SRC-502 SRC-471 SRC-472 SRC-476

About Dolomite →

Emerald at Serra das Eguas (Brumado)

Cluster of about two dozen bright green emerald crystals up to 1.2 cm from Serra das Eguas, Brumado.
Cluster of about two dozen bright green emerald crystals up to 1.2 cm from Serra das Eguas, Brumado.
Photo: Robert M. Lavinsky · CC BY-SA 3.0 · Source
Parallel-growth green-blue emerald crystals with colourless magnesite rhombs, Brumado.
Parallel-growth green-blue emerald crystals with colourless magnesite rhombs, Brumado.
Photo: Robert M. Lavinsky · CC BY-SA 3.0 · Source
V-shaped cluster of green-blue emerald crystals with colourless magnesite rhombs, Brumado.
V-shaped cluster of green-blue emerald crystals with colourless magnesite rhombs, Brumado.
Photo: Robert M. Lavinsky · CC BY-SA 3.0 · Source
Rich green emerald crystal of 3.2 cm with a shallow pyramidal termination from the Pinaje Mine, Serra das Eguas.
Rich green emerald crystal of 3.2 cm with a shallow pyramidal termination from the Pinaje Mine, Serra das Eguas.
Photo: Robert M. Lavinsky · CC BY-SA 3.0 · Source
Formula
Be3Al2Si6O18
Morphology
Clusters and parallel-growth groups of hexagonal prisms, some on magnesite
Typical size
Crystals up to about 1-3 cm
Color / luster
Bright green to green-blue, vitreous
Associated minerals
Magnesite
History
Only the Commons specimen labels (dealer text) document emerald here; no second source was found

Sources: SRC-831

About Emerald →

Geology of the locality

Setting
Magnesite and talc deposits of the Serra das Eguas range
Region
Bahia
Country
Brazil

Coordinates are those of Brumado town; the magnesite workings lie in the Serra das Eguas within the municipality. Includes the Pomba pit.

Sources: SRC-476 SRC-477 SRC-471

Sources

  1. SRC-476 · Website
    BrumadoWikipedia contributors · Wikipedia
  2. SRC-477 · Article
    Magnesite deposits in the Serra das Eguas, Brumado, Bahia, BrazilBodenlos, A.J. · 1954 · U.S. Geological Survey Bulletin 975-C, p. 87-170
  3. SRC-471 · Book
    Handbook of Mineralogy - DolomiteAnthony, J.W.; Bideaux, R.A.; Bladh, K.W.; Nichols, M.C. · 2005 · Mineral Data Publishing / Mineralogical Society of America
  4. SRC-502 · Website
    File:Dolomite-239950.jpg (Wikimedia Commons)Robert M. Lavinsky · Wikimedia Commons
  5. SRC-472 · Website
    Dolomite - Gallery (Minerals.net)Minerals.net · Minerals.net
  6. SRC-831 · Website
    File:Beryl-186430.jpg (Wikimedia Commons)Robert M. Lavinsky · Wikimedia Commons

Draft data from the Provenite workbook. Check entries against the cited sources before relying on them. Photos are open-licence images from Wikimedia Commons; the author and licence are given with each photo.