China stone is a medium grained, feldspar-rich partially kaolinised granite characterized by the absence of iron-bearing minerals. China stone is made of content that includes quartz, feldspar and mica. Quartz is the second most abundant mineral in the Earth’s continental crust, after feldspar where as, the mica group of sheet silicate (phyllosilicate) minerals includes several closely related materials having nearly perfect basal cleavage.
This kind of stone is found mostly in the Cornwall area of the United Kingdom. It is United Kingdom’s only indigenous source of feldspathic material. There are other names for the china stone such as Cornish or Cornwall stone. It is often times confused with another type of stone namely, pentuntse. Pentuntse is a historic term for a wide range of micaceous orfeldspathic rocks. Although, these two rocks are almost similar, there are a few differences as well.
These precious stones are carefully mined all through and brought for sale at relatively deservedly prices. It is of vital importance to maintain them or else they might not contain the value that they originally held. Here are a few tips on how to maintain marbles :-
Don’t make use of very large pieces of stone for it may be difficult to maintain them later on. Up to 4 sq ft is safe for most stones, otherwise, you may need an additional reinforcement for stones above that size and additional reinforcement means additional money to be spent.
2. Have a double stone thickness at the edges of counters and stairs.
3. Blunt the top edge by a taper or a half round to ensure it is not chipped. Chipped stone marble may not only look unpleasant but they also tend to spoil the condition of the surrounding material, giving place for unwanted content to grow.
4. Make sure the stone is perfectly levelled when fixing or else it tends to crack.
5. Avoid using stone in wet and heavy traffic areas like bathrooms, kitchens, balconies if you are concerned about its life cycle cost and durability.
6. Spilled coffee or tea left overnight gets absorbed in these soft stones and would be difficult to remove even after grinding. So make sure you take extra care while around this.