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Thank you for your prompt suggestions! I realize that it refers to slate, but was concerned about "optik" that it may refer to a process (as in fibreoptic) . Would appreciate your thoughts on this. Herzlichen Dank
Explanation: I would translate 'optik' with 'effec't. Anything with an 'effect' means that it looks like something else - for example wood effect, leather effect etc. Here, the tiles look like slate. There are quite a few other examples of effect used here: