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Q. I just had granite countertops installed and after they left noticed what appears to be a crack running diagonally the full length and edge. you can see and feel it yet it is not so open as to see light. the contractor says it is a vein. how can... Read More

There are two possible reasons the veins in your marble are changing color. First, white marble characteristically contains iron; it is possible the iron is oxidizing and turning to rust. If this is the case, it may be impossible to remove. Second,... Read More

Black marble, especially Negro marquina, is very susceptible to spalling. Spalling is a condition in which the stone flakes off and falls apart. Several factors can cause spalling: excess moisture, choice of setting material and method, the polishing... Read More

I am assuming that the black marble you are referring to is negro marquina. If this is the case you will find that this type of black marble is very susceptible to spalling of the veins. Over-polishing with either powder polishes or recrystallization... Read More

The material you are describing is probably a marble known as rossa perlinio. This type of marble, when it is formed has mud running through it and this is what the soft veins are---mud. Unfortunately the only cure is to fill the veins as the erode... Read More

This is a common problem with black marbles. How often are you using the recrystallization process? I have seen this problem when recrystallization is over applied and performed too often. At this point the floor may need to be re-honed. An... Read More

No, it is not true. Many marbles do have veins, but there are some that appear to have no veins at all. On the other hand many granites have no veins but there are also those that do have veins. Determining if a stone is marble or granite should not... Read More

The Marble Institute of America has developed four classifications for marble. This classification system is based on how sound the material is. A class A marble would be the the most sound where as a class D marble is very weak. The following is a... Read More

Onyx is very similar to marble and will react similarly. It can be honed and polished just like marble. FYI Onyx can be identified by its translucent appearance with its veins running in a parallel pattern. Onyx is found mostly on countertops and in... Read More

Q. I have just had a large granite countertop installation done, including two large pieces of verde fuoco, which are riddled with fissures as well as several cracks, some but not all of which appear to have started out as fissures. I want to replace... Read More