Granite is a very hard, granular igneous rock formed by the agglomeration of quartz crystals with feldspar and mica. It varies in colour (grey, green, pink, red, etc.) according to the relative proportions of these three substances and the presence of iron oxide or manganese oxide.
Porphyry is a finely grained, slightly translucent variety of granite.
Sandstone is a rock of sedimentary origin composed of small quartzose or siliceous particles naturally agglomerated by calcareous or siliceous materials.
Basalt is also an igneous rock, blackish, very compact and extremely hard.
The heading also includes other hard igneous rocks (e.g., syenite, gneiss, trachyte, lava, diabase, diorite, phonolite), as well as calcareous monumental or building stone not falling in heading 25.15 (including building limestone or Portland stone) and serpentine marble (or ophite) which, being a natural form of magnesium silicate, cannot be classified in heading 25.15.
The stones of this heading may be shaped or processed in the same ways as the stones of heading 25.15 (see the Explanatory Note to that heading). It should be noted that when broken up in the form of macadam these rocks are classified in heading 25.17, and that stones in shapes identifiable as road or paving setts, flagstones or curbstones are classified in heading 68.01even if merely shaped or processed as specified in the text of this heading.
Ecaussine, sometimes known as petit granit , Belgian granite or Flanders granite , falls in heading 25.15. Fused basalt is classified in heading 68.15.
When in the form of granules, chippings or powder, the stones of this heading fall in heading 25.17.ㅇ ㅇㅇ
Subheading Explanatory Notes.
Subheadings 2516.11
See the Explanatory Note to subheading 2515.11.
Subheadings 2516.12
See the Explanatory Note to subheading 2515.12.
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