Gabbro, with its interlocking crystalline structure.
No, limestone is harder than chalk. Limestone is a sedimentary rock composed mainly of calcite, whereas chalk is a soft, porous sedimentary rock composed mainly of calcium carbonate.
Gabbro does not have a streak because it is a coarse-grained rock made up of minerals like plagioclase feldspar and pyroxene that are harder than the streak plate. As a result, gabbro does not leave a streak when rubbed on a streak plate.
Limestone is the type of rock that is commonly dissolved by weak acids in water, such as carbonic acid, to form caves through a process known as chemical weathering.
"The two basic rocks found in the Mammoth Cave area are limestone and sandstone. Limestone is the "soft" rock (more water soluble) that is dissolved more easily by water. Sandstone and shale are the rocks that are on top of the cave. They are "harder" (less water soluble) and don't let the water soak into the cave." http://www.nps.gov/archive/maca/learnhome/cur_k3_cla.htm
When quartz limestone has recrystallized, it becomes marble. Marble is a metamorphic rock that forms from the recrystallization of limestone under high pressure and heat, resulting in a harder and more durable rock with a crystalline structure.
No, limestone is harder than chalk. Limestone is a sedimentary rock composed mainly of calcite, whereas chalk is a soft, porous sedimentary rock composed mainly of calcium carbonate.
Gabbro does not have a streak because it is a coarse-grained rock made up of minerals like plagioclase feldspar and pyroxene that are harder than the streak plate. As a result, gabbro does not leave a streak when rubbed on a streak plate.
Yes
dolomitic limestone is different from agricultural or hydrated limestone the difference is in the MgO content and hardness Dolomitic Limestone is harder than both and its MgO content is higher. The CaO is lower in Dolomitic limestone and High in the later.
Gabbro is a rock
Limestone is the type of rock that is commonly dissolved by weak acids in water, such as carbonic acid, to form caves through a process known as chemical weathering.
Limestone would be potentially harder until the clay is fired. The problem we have here is that "clay" is an ambiguous term. There is no homogenous or standard formula for clay. However, clays can generally be formed and baked to become set and hard. This is called firing. Fired clay tends to be quite hard, and depending on the formula, might be harder than limestone.
Marble is formed when limestone is metamorphosed. This process occurs when the mineral calcite in limestone recrystallizes due to heat and pressure, resulting in a denser, harder rock with a crystalline structure.
limestone
No. Gabbro is an intrusive igneous rock.
Limestone is too soft for use as tools. The Egyptians built monument out of limestone using tools made of harder stone - Flint, granite, etc. (and some copper tools)
Gabbro can be found on Earth, the Moon, and Mars.