I think your on about a form of opium called crystal flake opium. This is usually refined from crude opium that is collected straight from plant thats had more plant matter filtered removed from it. Its a bit better and stronger than regular opium but should not be injected due to the fact its still a crude form although somewhat less crude than regular opium. Even purified morphine powder is a lot more refined than opium and heroin is even more refined again.
Its main intended use is for smoking or eating. Another very very effective route of opium is plugging. I have plugged opium myself and in the right dose its very nice. Smoked i thought it tasted nasty though compared to powder heroin or black tar heroin which i smoked once about 1999 and have never seen it scince but you can tell the difference quite easily because no matter what dose you do if you have a tollerance its very hard to get trashed off it so to speak. Its more of a stimulating high than the wack that refined morphine or diamorphine would give you.
From what ive read up about it is that it can be Iv'd but it MUST be micron filtered very finely about 3 or 4 times before IV use, even then its still crude and injection is NOT reccomended. Crystal flake opium is still very crude though. The best way to compare it would be like comparing brent crude oil to car engine oil in its purest refined form with heroin being petrol grade if you get what im trying to say?. Friends of mine when in thailand and india. They did not get same effect of smoking loads of it instead of heroin but claim to of got shitfaced eating it, out there they was getting it cheap. Cheap enough to eat loads obviously. This product probably has more nostalgia value than drug strength value and is somewhat over priced when it is rarely found for sale in western countrys like the USA and UK. Obviously I cant go into what the actual unit value or cost was as i think its not allowed on here.
Hope that helps in someway. Peace .