Composition    |    What is Marble    |    Applications of Granite Slabs & Tiles
ASTM Specifications   |   Building Materials   |   Granite Finishes

What is Granite?

Granite is one of the oldest stone used to build. It is formed from liquid magma, the molten rock still found at the core of the planet, cooled slowly to form a substance approaching the hardness and durability of diamond. Granite is an igneous rock, the name reflecting its fiery beginnings. The chemical composition of granite is similar to that of lava. However, granite owes its hardness and density to the fact that it has been solidified deep within the earth, under extreme pressure. Over the eons, seismic activity has changed the crust of the planet, forcing veins of granite to the surface. Glaciers scraped off layers of dirt, sand and rock to expose granite formations. Typically revealed by outcrops, the deposits have been discovered on all the continents.

Composition

Granites are formed of an aggregate of crystals which are molded together without any interspace between them or which enclose one another. The magnificent crystallinity of granite is a striking characteristic.

It is accurate to speak of "granites," because many varieties of the stone exist. While they differ in color, texture and crystalline structure, the granites have three essential minerals in common:

  • Feldspar (50% or greater)
  • Quartz (25-40%)
  • Mica (3-10%)

These minerals occur in different proportions, giving each granite its own color, texture and structural characteristics.

With a wide range of different colors, you will be able to choose the most convenient granite stone to your project. Classical in gray, or modern in Pink or red, our stone will be suitable in flooring, as in your kitchen or in your bathroom .

Let us design your floor or bathroom with intricate designs and inlays. Our design staff will assist you with your color and style selections.

What is Marble?

Marble is a metamorphic rock, composed of metamorphosized limestone. In its purest form, marble is crystalline white calcite. Most marbles, however, are infused with impurities such as dolomite, silica or clay, providing variations in color and significant movement. The base colors of marble range from white to black with a broad range of hues. Marble is significantly softer than granite and therefore subject to greater wear and weathering.

Granite Finishes

The following finishes are available as standard from Tanhat Mining Company. Other custom finishes can be produced on a special order basis.

  • Polished
    The Polished finish is a highly reflective, mirror gloss finish. The full color, depth and crystal structure of the Granite is visible. A polished finish seals surface pores and is, therefore, nearly impervious to weather and chemical wear.
  • Honed
    A smooth, satin surface without reflection, the Honed finish shows the full color of the Granite. It is produced on the same equipment as the polished finishes; however, the honing process ends prior to the buffing stage.
  • Flamed
    The Flamed finish is produced by applying a high-temperature flame to the surface of the Granite. This flame fractures crystals on the face, leaving a rough-textured finish. Highly skid-resistant, this finish is an excellent choice for walking surfaces.
  • Sand Blasting
    The Sand Blasting is produced by applying a high-compressed air with sand to the surface of Granite.

ASTM Specifications

The most important standards for dimensional stone use published by the American Society of testing Materials (ASTM) which include:
ASTMC 97Absorption by weight0.40% max.
ASTMC 97Density2,560 kg/m3
ASTMC 99Modulus of Rupture1,500 psi10.34MPa
ASTMC 170Compressive Strength19,000 psi131Mpa
ASTMC 241Abrasion ResistanceHa=25.0
ASTMC 880Flexural Strength1,200 psi8.27Mpa

Some Building Materials :

CERAMICWOOD
+easy to procure+easy workability
-not a natural product-narrow colour range
-monotonous look-difficult to maintain
-breaks easily-poor life in areas of frequent usage
-only available in small sizes-poor water and fire resistance
MARBLEGRANITE
+light shades usually+good for outdoor and indoor use
-difficult to sort and match+cleans cleanest
-buying unpolished is risky+strong physical, chemical and thermal resistance
-low chemical and physical resistance+very long lasting polish
  +prices are standard
  +sorting by colour and grain is easy

Applications of Granite Slabs and Tiles

The beauty of granite coupled with its physical strength and chemical resistance makes it the material of choice in construction applications.

  • Floors :
    Slabs look better than tiles.
    Check material for staining, water absorption and rusting.
    Consider surface finishes other than polished.
    Darker colours preferable in commercial areas.
    Free lengths can be used.
  • Walls :
    Slabs look much better than tiles.
    Surface finishes other than polished can be consider for external walls.
    Keep weight in mind.
  • Skirtings at bottom of wall :
    Long thin slabs can be used.
    Finishes other than polished can be used.
  • Window sills / Door and window frames :
    Slab edges can be rounded or chamfered, and polished.
  • Kitchen Platforms - home :
    Fine grain material looks better than coarse grain.
    Material should be checked for staining, water absorption and pin holes.
    Front edges of slabs can be rounded and polished, or water-restraining strip can be put.
    For backsplash area, use granite strips in lengths matching the countertop lengths.
  • Kitchen Platforms - commercial :
    Defective material can be used to lower the cost since hygiene is the main consideration.
  • Bathroom Platforms :
    Rounding of edges or cut-out of basins should be got done from a professional company.
  • Counter Tops :
    3 cm thick slabs look better than 2 cm ones.
    Front edge can be profiled and shaped and polished.
  • Shelves e.g for showpieces at home / shops :
    Tiles or thin slabs with both surfaces polished can be used.
    Edges can be rounded or chamfered, and polished.
  • Standing Dividers :
    Edges can be rounded or chamfered, and polished.
  • Table Tops and other furniture :
    Buy only when completed including the edges and the legs.
  • Nameplates :
    Fine-grain black granite with edges chamfered gives the best contrast with the lettering