Important Building stones available in Bangladesh and Their Uses

The following are the important building stone available in Bangladesh.

1.Granite: This is a crystalline variety of igneous Rock. It is very heavy  and strong. It weighs 170 Ib per cu.ft. and the sp. Gravity  is  about 2.7. The crushing strength of good granite is about 1,800 tons per sq. ft.  Granite is used for works requiring great strength and durabikity  and also for  omamental and monumental works and also for inscription purposes. It is also used when the stone is subjected to abrasion like paving blocks ,road metals, etc. It is comparatively a costly stone due to high cost involved in its cutting and dressing. It is a small quantities in Sylhet and Chittagong.

2.Trap: It is an amorphous variety of igneous Rock.it is very strong, hard and durable. It weighs about 175Ibs per cu.ft. and sq. gravity is 2.85 and possesses a crushing strength of about 1,000 tons per sq. ft. This is suitable for ordinary building works  road construction. Its deposites in Bangladesh are very rare. It is found in traces at chhatak In Sylhet and rangamati in Chittagong.

Basalt: It an igneous rock. It is very hard, compact, tough, and durable. Its sp gravity is 2.85 and weight 180 lbs per cu.ft. is used as road metal and paving set to resist abrasion. It is extensively used in foundation of structures and as an aggregate in concrete works. It is  found in traces Sylhet.

Important Building stones available in Bangladesh and Their Uses

4.Sandstone: It is a sedimentary rock. It is a porous stone and exhibits different shades of colours. Sandstones are easier to work and dress. Its density is about 150lbs. per cu.ft. and sp gravity is 2.35 and its crushing strength is about 650 tons per sq ft.. It is externsively used as local building material. Sandstones are abundanty  found in Bangladesh . They are found at cox’s bazr, st Martin lslan. ,sitakundu in chandranath Hill range in chittagong Hill Tracts.

5Limestone: It is a sedimentary rock. The chief constituent of limest ones is calcite. It is not very hard .It is easily affected by acids to cause effervescence. Lime stone is weak against abrasion. Its weight is about 165 lbs per cu.ft. and the sp gravity is 260. Its crushing strength varies from300 to 600 tons per sq. ft.