2026-06-15T14:15:27Zhttp://doidb.wdc-terra.org/oaip/oaioai:doidb.wdc-terra.org:82682026-06-10T10:24:26ZDOIDBDOIDB.FIDfalse4DOIDB.FID
10.5880/fidgeo.2025.006
Franz, Gerhard
Gerhard
Franz
Department of Applied Geosciences, Technical University Berlin, Berlin, Germany
Schiperski, Ferry
Ferry
Schiperski
Department of Applied Geosciences, Technical University Berlin, Berlin, Germany
Khomenko, Vladimir
Vladimir
Khomenko
The National Academy of Sciences, M. P. Semenenko Institute of Geochemistry, Mineralogy and Ore Formation, Kyiv, Ukraine
Gernert, Ulrich
Ulrich
Gernert
Zentraleinrichtung Elektronenmikroskopie, Technical University Berlin, Berlin; Germany
Nissen, Jörg
Jörg
Nissen
Zentraleinrichtung Elektronenmikroskopie, Technical University Berlin, Berlin; Germany
Colombian emeralds – internal and external growth and dissolution features
GFZ Data Services
2025
EMPA
micro-X-ray fluorescence
SEM
IR spectroscopy
emeralds
EARTH SCIENCE > SOLID EARTH > GEOCHEMISTRY
EARTH SCIENCE > SOLID EARTH > ROCKS/MINERALS/CRYSTALS > METAMORPHIC ROCKS
EARTH SCIENCE > SOLID EARTH > ROCKS/MINERALS/CRYSTALS > METAMORPHIC ROCKS > METAMORPHIC ROCK PHYSICAL/OPTICAL PROPERTIES
Franz, Gerhard
Department of Applied Geosciences, Technical University Berlin, Berlin, Germany
Dataset
DOI of paper when available
10.1127/ejm/2018/0030-2703
10.5741/GEMS.51.3.222
10.15506/JoG.2021.38.1.26
10.5741/GEMS.59.1.46
CC BY 4.0
Emeralds from Colombia are among the most highly-prized and valuable gemstones. Their growth phenomena including information about the geology of the area were described in detail by Pig-natelli et al. (2015, 2022) and Schmetzer and Martayan (2023). Here, we present data obtained by scanning electron microscopy (SEM), electron microprobe analysis (EMPA), and infrared absorption spectroscopy (IR) for five emerald crystals. The surface of the crystals shows both, growth phe-nomena as well as dissolution phenomena, the latter as etch pits (EP). Such EP have been used previously for other beryl types, mainly from pegmatitic environments (Kurumathoor and Franz, 2018); the Colombian emeralds come from low-grade metamorphosed black shales and thus offer the possibility to extend the use of EP as a provenance indicator to other types of beryl deposits. Internal structures are manifested in chemical zoning, investigated by EMPA and micro-X-ray fluo-rescence (µXRF). The crystals are characterized chemically by EMPA, polarized IR spectroscopy of oriented crystals showed the presence of fluids in the channels of the beryl structure.