Glenmore Curling :: Types of Granite

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Glenmore Curling · Types of Granite

Glenmore Curling » English » Learn To Curl » Types of Granite

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How It's Made: Curling Stones

Types of Granite for Curling Stones

Blue Hone Granite

This type of granite is light gray in colour, with random white specks throughout the stone. Half moon shaped chips can be found in the strike bands of blue hone stones that have been used for many years.

Red/Brown Trefor Granite

Characterized by its colour, usually a light to dark reddish brown, this granite is a larger grained granite with white and black flecks that run throughout the stone. This granite is suitable for both recon-ditioning and inserting. Second to blue hone granite in running sur-face quality, red trefor granite is the number one quality granite for striking bands. Note: striking bands on quality curling stones do not last forever. Overtime the trefor granite will wear flat, because of this characteristic it is important to have the striking bands re-shaped to their original convex shape, approximately every 25 years. This ensures proper hitting and will prevent chipping above and below the striking bands.

Blue Trefor Granite

Usually a bluish gray in colour, this granite also has white and black flecks throughout. This granite can be reconditioned but is more prone to premature pitting in its lighter shades. Like all trefor granite, blue trefor is an excellent candidate for inserts. As mentioned in the red/brown trefor section, it is important to keep in mind that the striking bands of trefor granite stones do start to wear flat overtime. Re-profiling the strike bands to their original shape will prevent any inconsistencies in the stones when they are hit and will stop any chip-ping from occurring above or below the striking band. Glenmore's rocks are made of blue trefor granite.

Gray Trefor Granite

Grayish brown in colour, this granite like the blue trefor has white and black flecks throughout. It also is prone to premature pitting, but stands up well to hitting. Inserting of gray trefor is highly recommend-ed. As it is part of the trefor family, all of the characteristics mentioned in the other trefor sections do apply to the gray trefor granite.

Keanie Granite

This granite is pinkish in colour, it has large white spots and black flecks throughout. Keanie is a porous granite and is very susceptible to large pitting in the running surface. Due to this porosity, the strik-ing bands wear rapidly and flat spots develop from hard hits. The granite beneath the striking band is crushed everytime a rock is hit. Neither inserting nor reconditioning is recommended for this granite. If your club’s stones are made from this type of granite, serious con-sideration should be given to replacing your stones. Your keanie stones can be used as a trade in on a new set of trefor stones, or on a newly remanufactured set of insert stones. (Please see both the new stones section and the reconditioning and repair section)

Common Green Ailsa Craig Granite

Greenish in colour with large black flecks that usually has white deposits around them. Due to the dissolvable materials in this granite that causes premature pitting, reconditioning is not recommended. Inserting this type of granite is possible, however it depends solely on the condition of their strike bands. Like the blue hone granite, the striking bands of the common green stones also begin to chip in half moon shapes. The number and depth of the chips should give you an idea of the life that is left in the striking bands. These chips are not considered repairable once they have begun.

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