СПИСАНИЕ НА БЪЛГАРСКОТО ГЕОЛОГИЧЕСКО ДРУЖЕСТВО, год. 79, кн. 3, 2018, с. 165–166 REVIEW OF THE BULGARIAN GEOLOGICAL SOCIETY, vol. 79, part 3, 2018, p. 165–166 National Conference with international participation “GEOSCIENCES 2018” Mineral composition of Neolithic nephrite-bearing edge tools from the Kyustendil District, SW Bulgaria. Preliminary data Минерален състав на неолитни нефритсъдържащи сечива от района на Кюстендил, ЮЗ България. Предварителни данни Irina Marinova, Elena Tacheva, Petya Ivanova Ирина Маринова, Елена Тачева, Петя Иванова Institute of Mineralogy and Crystallography, Bulgarian Academy of Sciences, 1113 Sofia; E-mail:
[email protected] Keywords: Neolithic, stone edge tool, nephrite, Struma River valley. Introduction Material and methods This short communication presents results of miner- The museum exhibits were investigated in a non- alogical study on two stone edge tools from the sur- destructive way following requirements of museum roundings of Kocherinovo town and Mursalevo vil- officers at the RHM-Kyustendil. A powder sample lage (the Struma River valley), SW Bulgaria. The was taken from each of them by scratching with a stone tools are museum exhibits of the Regional steel blade and investigated under stereomicroscope Historical Museum (RHM) in the town of Kyustendil and scanning electron microscope. Step-scan X-ray and were found in 2014, in cultural layers of Neolithic powder diffraction data were collected over a range settlements. The stone tool from the surroundings of of 3–70° 2θ with CuKα radiation on D2 Phaser- Kocherinovo town has field inv. no. 3 and dimensions Bruker AXS Bragg-Brentano diffractometer (30 kV, of 2.6×2.4×0.65 cm while that one from the surround- 10 mA, step of 0.05° 2θ and a counting time of 1 s/step).