Decoding Black Circular Stones and Bouncing Objects

While exploring the vast and mysterious expanses of the ocean, it is not uncommon to come across intriguing and unusual objects. One such find might be a small, circular, black stone that bounces when hit.

Possible Explanations for Your Find

Based on the description provided, your black circular object could be one of several natural or artificial items. Here are a few possibilities:

Obsidian

If it is extremely hard and difficult to break with a hammer, it might be obsidian. Obsidian is a naturally occurring volcanic glass that is typically black or dark brown. It has a smooth, glassy texture and can be very hard, often far more durable than typical stones.

Black Pebble

Similarly, it could be a black pebble. Black pebbles can form from volcanic rocks like basalt, which is a dense, hard rock that can sometimes be rounded into pebbles by wave action.

Man-Made Black Glass

Other possibilities include man-made objects that have been polished by the sea, such as pieces of black glass. This could be from a broken mirror or a discarded item that has been naturally smoothed over time.

Opal and Jewelry

It could also resemble a cabachon cut black opal, though such items are generally softer and typically do not bounce or withstand hammer blows. If it were indeed a black opal, it would likely be too soft to handle in a practical manner.

Artificial Objects

Given its unusual properties, it’s also possible that the object could be an artificial item. For instance, it may be a ball made from synthetic materials or even a piece of a tire, especially if it is heavy and bouncy.

Basalt: A Common Ocean Find

Basalt, a dark-colored fine-grained igneous rock composed mainly of plagioclase and pyroxene minerals, is a common occurrence in oceanic areas. It often forms as lava flows and can also be found in small intrusive bodies such as igneous dikes or thin sills. It is similar in composition to gabbro.

Further Considerations

If you can provide more information, such as the texture, weight, and any markings on the object, it will help in further identifying it. Photos of the item would also be very helpful.

The ocean is full of mysteries, and it is fascinating to discover new and unexplained objects. Whether it's a natural wonder like obsidian or a remnant of man-made technology, each find adds to our understanding of the diverse and ever-compelling world we live in.

Note: Questions from Howard Medhurst suggest the possibility that the stone might be obsidian or solidified lava, as there are subsea volcanoes in various parts of the world.