Ruby Mines in IndiaIndia ruby mines
Ruby quarrying in India | Gems & Gemology
Karur-Kangayam and Hole-Narsipur belt in the states of Tamil Nadu and Karnataka in the south of India are known throughout the sub-continent for their precious stones such as saphire, lunar stone, iolithe, avamarine, garnets, sunstone as well as aluminium oxide. Karur itself is known for its ruby. Rubin is also found in Subramaniam (also known as Red Hills), near Madikeri in Karnataka.
In Channapatna (Figure 1, top left), about 280 km from Madikeri, is known for its stellar ruby. The high-grade translucent jewels come from the Karur area, whereby the colour along this jewel belts varied. Karur's mines are on sparse ground on the side of the road; the cities of Kangayam and Paramatti also have ruby mines.
Madeikeri is a secluded mountain resort surrounded by luxuriant verdant woods and situated in the west of India's Ghats. This ruby is light, translucid to clear and of good qualitiy. Ruby granules, generally referred to as ruby stone, are used to produce artefacts such as rods and crystallised spheres. The city of Subramaniam, near Madikeri, has large six-sided ruby columns; there are also occurrences in the surrounding countrys.
This ruby ranges from 20 to 100 mm over the pinakoidal surface, whereby the length over the prisms varies from 10 to 50 mm. Channapatna and other surrounding towns in the Bangalore area of Karnataka have non-transparent chestnut-brown ruby stars. It' obtained from reddish and amber soil in mangos and coconuts gardens, not from conventional mines.
Granulite, the Karur ruby hosting stone, is similar to the Mozambique ruby hosting stone (see GNI 2012, pp. 309-311). Some areas like Sengal and Kiranur have ruby associated with gemstone iolitolite. Ruby in pamacondampalayam is found with a spinell, sapphire and corderite edge (Figure 1, bottom left), while the Madikeri ruby is associated with plagioclas, argite, garnet, silimanite and sphenes in alumina granulite (Figure 1, bottom right).
Madeicki ruby is also found in corundum-fuchsite slate which has a siliceous composition of fuchite glimmer, silica, corundum as well as ruby. To sum up, the good grade ruby comes from the good grade lava rock in Karur; plate shaped hexagonal crystal, which range from clear to semitransparent, is obtained from Madikeri alumina granulite; and in Channapantna's mangos and coconuts, you will find opaculate stellar rubies.
PhD student at the University of Pune, India. Tauruuja Marathe is Adjunct Lecturer of Geochemistry at Fergusson College in Pune, India.