Yes, it is possible. In practice, no. The stone is fairly fragile and not very robust. Stone arrowheads shatter far more easily than steel arrowheads, and the problem will only worsen as the weapon lengthens. Also, if you try to draw the blade from the annealed tip, it will be impossible to do so without breaking off the end.
The best way to make a lava sword is to start with a piece of obsidian, which is smooth and easy to work with. Obsidian is formed when water flows over volcanic rocks causing them to cool quickly, forming a glass-like surface layer called sclerotic crust or scoria. This method of making swords was common in ancient Japan.
You can also make a lava sword using volcanic rock instead. But avoid pumice and tuff (the two main types of volcanic rock) because they are heavy and not very ductile, which means they won't bend easily. Instead, use trachyte or phonolite, which are light and highly flammable.
Lava is mostly made up of silica (which is what glass is made from), so it should be no surprise that glass is the most common material used for sword blades. Lava also contains some iron, but even a blade of solid iron would be too soft to be effective.
Yes, technically. You could certainly fashion a weapon out of stone. In reality, humans used to carve blades and other sharp stone tools out of shale. A stone sword would be extremely difficult to wield. It would be virtually impossible to inflict serious injuries with such a weapon.
Today's swords are generally made from steel, but ancient swords were sometimes made from other materials. Swords made from certain types of wood or bone can still be found in museums. But most modern weapons are made from metal: usually several layers of thin sheets of steel or other alloys joined together to create a single piece. The ancients knew how to work metals too; they just didn't have access to as many high-quality materials as we do today. There are some ancient swords that remain intact enough to see that they were made from iron instead of steel, but they are rare.
Some ancient swords did exist that were made from stone. These were not commonly used because they were expensive to make and maintain. Carving a blade out of rock is labor-intensive process: it requires skilled workers who know how to handle a knife without cutting themselves. In addition, stone weapons tend to wear out faster than those made from metal because there aren't any flexible tissues inside a stone blade that can compensate for wear and tear.
So, yes, you can make a sword out of stone.
No, not at all. Obsidian is a brittle and tough stone. This implies that it is readily broken, yet it can also be made incredibly sharp. In fact, obsidian arrowheads and knives are among the world's sharpest. These properties make obsidian useful for cutting tools, but not for weapons.
First of all, obsidian is hard to find in nature. It's usually formed as volcanic glass, which means that it contains a high concentration of silica molecules. The only source of obsidian in the world is actually volcanoes. There are several types of obsidian, distinguished by their chemical composition and coloration: black, green, gray, pink, or red.
Black obsidian is the most common type and it comes from Mount Lhotse in Tibet. Green obsidian is rare but it can be found in French Alps and on Sakhalin Island (Russia). Gray obsidian occurs across much of North America, especially in Washington State and Oregon. Pink obsidian is used in some jewelry because of its beautiful color. Red obsidian is the result of lava cooling under water and this type of obsidian is often found near active volcanoes.
Secondly, even if you could find a way to work with obsidian, it would not be easy. You would need to break off chunks from the rock surface, so they can be worked into desired shapes.
Many people claim that it is impossible to cut a stone with a sword without hurting it. Most of the time, the sword will be shattered and shatter into small fragments, hurting you and others around you. However, there are some stones that can be cut with a sword, such as onyx or marble.
The key here is how hard you strike the stone with the sword. If you hit it very hard, then you may be able to cut through it. Of course, if you do go through the hard rock, you should try not to hurt yourself or anyone else in the process.
This experiment shows that it is possible to cut through certain kinds of rock with a sword. Of course, using this method will likely break the blade of your sword. You might be able to continue cutting after replacing the blade, but only someone who knows what they are doing could actually do this in real life.
Overall, swords are not designed to cut through hard objects such as rocks. They are designed to slash and stab enemies, so if you need to cut through something hard, you should probably use another tool for this purpose.
But, in terms of bones, they are perfectly viable and have been utilized all throughout the world. Speartips and arrowheads, as well as clubs and knives, are all possible. Swords aren't like other weapons. Anything as long as a sword made of solid bone would most likely shatter in fight. The bone would break if hit with another blade or stone weapon.
The word "sword" is actually a broad term that describes any long, single-edged knife or cutting tool made of a hard material. So yes, you can make a sword out of bone if you so choose. But it wouldn't be very effective for its purpose.
Even if you were to discover a diamond large enough to be carved into a sword (which is very impossible), diamonds are fragile and may quickly break, even if the flat of the blade does not scrape at all. The blade would lose its sharpness and be prone to chipping.
Diamonds can only be cut by other diamonds or by using hard materials like glass or steel. If you try to cut diamonds with any other material, you will ruin the stone.
Also, keep in mind that swords have edges, while diamonds do not. A diamond's surface is very smooth and perfect, but still, it cannot be cut. Only certain rocks containing carbon, such as graphite or quartz, can be used as knives for gems like diamonds.
Finally, avoid exposing diamonds to water because they will eventually become tarnished. This affects both gold and platinum jewelry items that contain diamonds, but gold is more valuable so it is usually chosen over platinum.
In conclusion, no, you cannot cut a diamond with a sword. Even if you found one big enough, the blade would soon be ruined and the diamond would be lost forever.