In rocks, opals are found in the sedimentary ad metamorphic rocks so the correct answers are C.
Location 3 Opal is observed as types: volcanic opal which infills vesicles and cracks in igneous rocks, and the extra acquainted sedimentary or sandstone kind that's observed in Australia's important fields. Most deposits in different international locations are volcanic opal, an awful lot of that's liable to crazing.
How strong is opal?
Most authentic strong opals have an irregularity in this area – curved or bumpy because of their herbal formation – while a synthetic stone might be flawlessly flat due to the fact the 2 sections are flattened in order that they may be glued together.
Thus it is clear that Location 3 in the figure shows where opal is most likely to form.
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