Gemstones associated with metamorphic rock include beryl, jade, lapis lazuli, turquoise, spinel, ruby, sapphire and zircon. Rocks and minerals are in a constant state of change, which is referred to as the rock cycle. Igneous rock can change into sedimentary or metamorphic rock.
Lime is a soil amendment made by grinding limestone, a naturally occurring type of rock that is very high in calcium. Two types of lime are commonly used in lawns and gardens, agricultural lime and dolomitic lime. Agricultural lime, also sold as garden lime, is made from calcium carbonate.
Lime for lawns comes in two types of applications: dolomitic and calcitic. Although both provide calcium carbonate (nutrition for grass and an acid neutralizer), they have some differences. Dolomitic limestone provides magnesium, so use this type if your pH test shows your lawn is deficient in this mineral.