Some minerals are hard yet some are soft. Talc is the softest mineral as diamond is the hardest mineral. You can look at this on the hardness scale. It goes from one to ten, so talc is one as diamond is ten.
feldspar
Hawai'i has numerous minerals. In fact, you could probably find all known minerals here in Hawai'i (but not occurring naturally). The most abundant naturally occurring minerals in Hawai'i are: # Basalt Magnesium Silicate (from Volcanoes) - e.g. lava rock, blue rock, obsidian # Calcium Carbonate (from Coral and hard shell sea creatures) - e.g. Sand
90% of minerals are silicate.
Minerals: They rock your world. Minerals: Because you're worth it. Minerals: Get your daily dose of earth's bling. Minerals: Making rocks look good since forever.
Major Minerals
Quartz.
idiochromatic minerals are those minerals which have fairly constant colour. they are hard minerals and they posses only in metals
Soft or hard water has to do with the amount of dissolved minerals in water and what those minerals are. "Harder" water has more dissolved minerals (like calcium.)
More minerals in hard water
Calcium makes them hard.
Calcium makes them hard.
no
hydroxyapatite
Mineral content. more minerals means hard
minerals make bone hard and are very important in blood composition
Hard minerals in geology have properties like durability and resistance to scratching, making them useful for tools and construction materials. They are also important for identifying rocks and minerals in the field.
One can make water hard by adding minerals such as calcium and magnesium to it. These minerals can increase the water's mineral content, making it harder.