Provenite

Coscuez Mine

MineUnknownDraft data

5.6514° N, 74.0694° W · ± 10 km

Emerald from Boyaca, Colombia, with photos of specimens from this locality.

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Minerals found here

Emerald

Emerald at Coscuez Mine

Light green, partly gemmy emerald crystal of about 1.7 cm from the Coscuez Mine.
Light green, partly gemmy emerald crystal of about 1.7 cm from the Coscuez Mine.
Photo: Robert M. Lavinsky · CC BY-SA 3.0 · Source
A 1 cm bright green emerald crystal still embedded in its matrix, Coscuez Mine.
A 1 cm bright green emerald crystal still embedded in its matrix, Coscuez Mine.
Photo: Robert M. Lavinsky · CC BY-SA 3.0 · Source
Emerald crystal of 3 cm on white calcite matrix, Coscuez Mine.
Emerald crystal of 3 cm on white calcite matrix, Coscuez Mine.
Photo: Robert M. Lavinsky · CC BY-SA 3.0 · Source
Doubly terminated light green emerald crystal of 2.2 cm, Coscuez Mine.
Doubly terminated light green emerald crystal of 2.2 cm, Coscuez Mine.
Photo: Robert M. Lavinsky · CC BY-SA 3.0 · Source
A 2.5 cm emerald crystal perched on the side of its matrix, Coscuez Mine.
A 2.5 cm emerald crystal perched on the side of its matrix, Coscuez Mine.
Photo: Robert M. Lavinsky · CC BY-SA 3.0 · Source
Formula
Be3Al2Si6O18
Morphology
Hexagonal prisms, single crystals in matrix and loose crystals
Typical size
Crystals commonly 1-3 cm
Color / luster
Light to bright grass-green, some with a bluish tint; vitreous
Associated minerals
Calciteparisite

Sources: SRC-817 SRC-819

About Emerald →

Geology of the locality

Setting
Emerald-bearing vein and veinlet zones (northeast-striking, steeply dipping) with a conjugate set of nearly horizontal mineralised fractures; structure and mineralogy similar to the Muzo deposit about 10 km to the south
Type
Hydrothermal
Region
Boyaca
Country
Colombia

Coordinates are those of San Pablo de Borbur town (Spanish Wikipedia), the municipality that contains the mine; the mine itself is not placed exactly. Also spelled Cosquez.

Sources: SRC-817 SRC-818

Sources

  1. SRC-817 · Database
    Coscuez Mine, San Pablo de Borbur, Western Boyaca Province, Boyaca Department, ColombiaGemdat.org (citing Kievlenko, E.Ya. 2003, Geology of Gems) · Gemdat.org (Hudson Institute of Mineralogy)
  2. SRC-818 · Website
    San Pablo de BorburWikipedia contributors · Wikipedia (Spanish)
  3. SRC-819 · Website
    File:Beryl-120458.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.