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Patrick
Patrick, Construction Project Manager
Category: Home Improvement
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Experience:  30 years commercial construction and 23 years house remodeling projects
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What is a fissure in a granite countertop

Resolved Question:

What is a fissure in a granite countertop?
Submitted: 5 years ago.
Category: Home Improvement
Expert:  Patrick replied 5 years ago.
The MIA, Marble Institute of America, in their 2005 Residential Stone Countertop Installation Guide states that, “Fissures occur naturally in many stone types. A fissure is defined by the American Geological Institute as ‘an extensive crack, break, or fracture in the rock, which may contain mineral-bearing material.’ The term ‘fissure’ is used commerically in the stone industry to describe a visible separation along intercrystalline boundaries. This separation may start and stop within the field of the stone, or extend through and edge. A fissure differs from a crack, in that it is a naturally occurring feature in the stone.”

Granite contains fissures. To determine a crack versus a fissure, you should not be able to catch a nail on a fissure. If you run a level over the fissure you should not have a difference in the plane of one side of the fissure to another. Good luck. If this has proved helpful please remember to hit ACCEPT, otherwise I do not receive credit. Thank you.
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