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Vključki v dragih in okrasnih kamnih : magistrsko deloJeršek, MihaZ analizo vključkov v dragih in okrasnih kamnih lahko razmeroma hitro in zanesljivo ugotovimo vrsto, značaj in izvor dragulja. Obenem lahko sklepamo na razmere ob nastanku dragulja ali na pogoje, ... katerim je bil izpostavljen po njegovi kristalizaciji. V magistrskem delu smo to potrdili v primerih kremenov iz Slovenije, safirjev iz južnega Vietnama, umetnega moissanita in vkovanih dragih kamnov v kelihu iz leta 1732. Drobnokristalni kremeni z nekaterih slovenskih nahajališč imajo drobnozrnato strukturo. Sestavlja jih kalcedon z vključki mineralov, ki kremen značilno obarvajo. Hematit vpliva na rdečo in sivo obarvanje, akaganeit na oranžnorjavo, magnetit in pirohroit na črno, a maghemit na sivo obarvanje drobnokristalnega kremena. Debelokristalni kremeni iz okolice Cerknice so nastali v času diageneze pri povišanih p/T pogojih. To dokazujejo njihove kristalne oblike in vključki karbonatov ter kremenov. V omenjenih kremenih je veliko tekočinskih vključkov, katerih oblika in barva dokazujeta, da so sekundarnega značaja in da so nastali pri temperaturah pod 140°C. Safirji iz južnega Vietnama imajo povišano količino železa, kar je značilno za safirje iz bazaltov. Železo vpliva tudi na modro in rjavo obarvanje safirjev ter na videz edinstvenih vključkov v obliki šesterokrake zvezde. Na osnovi značilnih vključkov v obliki šestkotnih ploščic in med seboj vzporednih belih iglic lahko ločimo črne moissanite umetnega nastanka od črnih diamantov, ki nimajo omenjenih vključkov. Na osnovi trdnih vključkov in toplotne prevodnosti smo določili 459 dragih kamnov v kelihu iz leta 1732. Ugotovili smo, da so to rubini iz Mjanmara, smaragdi iz Avstrije, safirji iz Šrilanke, diamanti iz Indije in Brazilije ter granati verjetno iz Indije. Določili smo še ametiste in citrine, ki jim nahajališča nismo mogli dokazati. Štirje kamni so bili v kelihu zamenjani kasneje, kar smo potrdili na osnovi oblike in vključkov. To so: umetni rubin, safir, steklo in zeleno obarvani ahat.Type of material - master's thesis ; adult, seriousPublication and manufacture - Ljubljana : Univerza, NTF, Oddelek za geologijo, 2000Language - slovenianCOBISS.SI-ID - 162037
Author
Jeršek, Miha
Other authors
Mirtič, Breda
Topics
dragi kamni |
okrasni kamni |
vključki |
umetni kamni |
kremen |
rubin |
safir |
smaragd |
magistrska naloga |
mineralogija
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Library/institution |
City | Acronym | For loan | Other holdings |
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NTF, Department of Geology, Ljubljana | Ljubljana | NTFGEO |
outside loan 1 cop.
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Database name | Field | Year |
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Links to authors' personal bibliographies | Links to information on researchers in the SICRIS system |
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Jeršek, Miha | 18567 |
Mirtič, Breda | 07177 |
Source: Personal bibliographies
and: SICRIS
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