Abstract
Some natural stones, such as marble, onyx and limestone are translucent and commonly used in night lamps, lampshades, and backlit decorations in hotel lobbies and other facilities. However, there is no study in literature with respect to the luminous transmittance or transparency of natural stones. In this study, the luminous transmittance of 12 different carbonate based natural stones was assessed. An apparatus consisting of a light source, a light conducting tube and a luxmeter was designed to determine luminous transmittance. Also, the samples have been examined with regard to grain size to define their mineralogical and petrographical characteristics. As a result of the studies, it has been found that marble and onyx marble can transmit light to a greater extent compared to limestone. And it has been seen that the efficient factors in those samples are color, crystal type, grain sizes and cement substance of the rock.
Kurzfassung
Einige Natursteine, wie Marmor, Onyx und Kalkstein sind durchscheinend und werden allgemein für Nachtlampen, Lampenschirme und beleuchtete Dekorationen in Hotel-Lobbys und anderen Einrichtungen verwendet. In der Literatur gibt es jedoch keine Studie, in der Bezug auf die Lichtdurchlässigkeit oder Transparenz von Natursteinen genommen wird. In der diesem Beitrag zugrunde liegenden Studie wurde die Lichtdurchlässigkeit von 12 verschiedenen Natursteinen auf Carbonatbasis evaluiert. Eine Vorrichtung, bestehend aus einer Lichtquelle, einem Lichtleiterrohr und einem Beleuchtungsmesser wurde entwickelt, um die Lichtdurchlässigkeit zu bestimmen. Darüber hinaus wurde auch eine Korngrößenanalyse durchgeführt, um einen mineralogischen und petrographischen Bezug herzustellen. Als Ergebnis der Untersuchungen wurde festgestellt, dass Marmor und Onyx-Marmor in einem größeren Ausmaß lichtdurchlässig im Vergleich zu Kalk sind. Außerdem hat es sich gezeigt, dass in diesen Gesteinsproben Farbe, Kristalltyp, Korngröße und die Kittsubstanz des Gesteins wichtige Faktoren bezüglich der Lichtdurchlässigkeit sind.
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