Rough Opal or Similar Mineral Specimen

The item is a raw mineral specimen, likely a piece of rough opal or a similar mineral exhibiting conchoidal fractures and a creamy white to off-white color with areas of transparency. It is irregular in shape, with evident natural cleavage planes and rough, unpolished surfaces. The specimen is held in a hand, providing relative scale and context. The mineral appears to be embedded in or attached to a matrix of a darker, brownish-grey rocky material. The white mineral displays some internal fracturing and potentially some subtle iridescence or play of color, which is characteristic of opal, although the image does not clearly confirm this. The texture is somewhat uneven and appears to be a mix of smooth fracture surfaces and rough, pitted areas from the surrounding matrix. There are no visible manufacturing marks, signatures, or stamps present on this natural specimen. The overall condition appears typical for a naturally collected raw mineral, with no signs of artificial wear, damage, or repair. Its age is geological. Quality indicators would include the clarity, color, and any presence of play of color if it is indeed opal.