vname, you have very good information about distribution of the gemstones in Nepal and khai ke khai ke, you are absolutely correct about our resources development. riten as amitraja and ritthe said pushparaj is known as yellow sapphire. And for Maverick, there are many more things in the world to know if you can get time from girls.
abnish, of course we can enrich these gemstones in Nepal. The required machinaries are also within reach of our local businessmen. Some of them have already started there work on it. But we need more skilled labors. Indian labors are world reknown for the gemstones enrichment. Some of our local businessmen have also established an organization. It has the link to the map showing the distribution of the gemstones in Nepal. This is not the good map, however it is useful for basic information.
Proper mining techniques and skilled labors are what we need now in our gemstone mines. People are simply using chisel and hammer for breaking the rock masses which contain gem crystals. Not all gems have greater hardness than hammer (iron). Even some people are using explosive for blasting the rocks. This may cause severe damage to the crystals.
This crystal is from Barala vdc, Achham where I went for the exploration of one deposit. The cracks seen in this cystal are due to hammering.
Can anyone guess what gemstone crystal is this?
What is MT or MCT and where is it? - just curious to know.
Actually I started this thread to give and get infomation about gemstones in Nepal but now it is getting into hardcore geology. You threw such a question which looks simple at general but if you start to dig more it will appear as the greatest dilemma in himalayan geology. But I don't want people over here to get into this trouble.
So in general words, MT = Mahabharat Thrust and MCT = Main Central Thrust are the large scale discontinuties in the rock that is extended over the himalaya. As all of us know that Indian contient is moving towards the north and Tibet is fixed these discontinuties were developed. It is believed that along these discontinuities rock mass moves and that will release energy created due Indian continental push. Besides MCT, and MT we have other master thrust like MBT (Main Boundary Thrust), MFT (Main Frontal Thrust) and STDS (South Tibetian Detachment System). Among all these thrusts now MFT is considered as most active along which movement of the rock masses is taking place. Unlike, MCT which is distributed along the whole length of Himalaya, MT is only found around the Kathmandu valley and there is great debate among senior Nepalese as well as international geologists whether the MT is part of MCT or separate.
And these thrusts do have implications on our daily life specially while talking about construction work. While constructing roads, bridges, dams or tunnels we try to avoid the area around these thrusts. The rock masses around these thrusts generally have several cracks and discontinuites which make rock mass weaker and our structure will be unstable. But sometimes we can't avoid these thrusts specially while constructing roads and as result we will have landslide on the road during the rainy season. Engineers usually perfom RMR (Rock Mass Rating) of the site to evaluate it for the construction.
This thrusts not only have negative role, some mineralizations may occur along these thrusts and all of our hot water springs are formed due to these thrusts.
Below here is the geological map of Nepal by BN Upreti and others, which shows the location of different thrusts as well as different types of rocks in Nepal
Map: BN Upreti and others
Thanks for the info.
BTW, do you know Dr.Rai from TU (TC)? I was in touch with Dr.B.N Upreti through emails. He used to be Dept. Head onwe time.
But anyway, thanks again.
Are u doing master's or PhD here in US?
Dr. Upreti was dean of Institute of Science and Technology (TU) when I visited Nepal last time (June-July 2008) for my fieldwork and Dr. Rai was head of Geology Department, Tri-Chandra Multiple College. Dr. Upreti was telling me that he would leave that position pretty soon and come back to Tri-Chandra Multiple College. So I don't know the current status of both of them. And one thing, I had taken courses with both of them. And about me, I am doing master's over here. You have already written me that you are not from geology background. But I will like to know about you.