1. RAMAN SPECTROSCOPY ON GEM-QUALITY MICROCRYSTALLINE AND AMORPHOUS SILICA VARIETIES FROM ROMANIA. Authors: DANA POP, CIPRIAN CONSTANTINA, DAN TĂTAR, WOLFGANG KIEFER.2. ARENITE CONCRETIONS WITH AXIAL CHANNEL FROM THE BADENIAN DEPOSITS OF CHEIA (TURDA) - A NEW TYPE OF CONCRETIONS. Authors: IOAN MÂRZA, CIPRIAN CONSTANTINA, HOREA PÂRLEA.3. MINERALE GEME ASOCIATE GENETIC OFIOLITELOR MEZOZOICE ŞI GHEIZERITELOR NEOGENE, DIN MUNŢII APUSENI DE SUD. Authors: IOAN MÂRZA, CIPRIAN CONSTANTINA.