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actually has to do with how we describe metamorphic rocks a minimalist garage to describe as either being foliated or non foliated now here's the big difference between what foliation means foliation means that this rock contains platy minerals now was a platy minerals will seek back to our discussion on the silicate structures though sheet structures were you arrange things the silica tetrahedron in sheets and then sort of made sandwiches with the sandwich material being other catalines and then you stack them on top of each other the form things like mica and things like that that would be a platy minerals those are platy minerals if you take a rock that has lots of platy minerals and they're all align with each other just picture this now between know she's is sort of weaker bonding so you can break it be when a member little cleavage so mineral clean that's why you to take those books apart of mica RA so here we have a rock that has played I minerals in it all of them are align and so he would break along those weaknesses and so that would be what we refer to as fully Asian so fully Asian the 1st the ability to break along these planes a weakness well it's just showing the different kinds of fully Asian and again let me start off by old favorite shale rate we take shale and what shalees are claiming girls and member now they are she silicates so when that shale 1st form would happen as all those little silicate minerals fell down we're all parallel to each other in the individual layers all the shale and then what we're going to do now is we're gonna metamorphose this that and here is we're gonna do we're in of say just under pressure so here we take the shale now and we're gonna sit under pressure and under the new pressure now those clean minerals are very stable and what they're gonna start doing is they're going to start changing re crystallizing into let's say Micah OK now here's the point less a for example here was the pressure your 2 fingers and as these new platy minerals form what they're going to do they're going to re orient themselves in such a way that they are stable under those new pressure condition so here's what I want you to picture in your mind take a coin and I what I want you to do is the whole disscourn between your 2 fingers like that and you have you told any way you want but press on it as hard as you can and question what would be the stable position the of thing for example if you took the coin and you put the coin like this and you're pressing on how stable do you think that would be just tried you press on it harder not pretty soon it's gonna flip out that's always to is not a stable condition on the other hand if you took the coin and you turned it sideways like that and nominal your fingers are directly opposite each other that's gone on rotation depression now you can push as hard as you want and it will do anything because it's in a stable position so no dial all these new platy minerals are being created out of the claim minerals not what they are or the like is there all root in getting on order so they're all perpendicular to the forces decreeten now we have instead of plain minerals now we have mica and quartz I well to new rock when we call it we call it slate that's what Slate it basically slate is a metamorphose shale Now the the thing about that we called as slaty cleavage Y because of you take just a wedgie some kind of chisel you can break them off in the sheets very uniform and think very smooth surface that slaty cleavage for example back before the days of the white born a green born Orange board with their blackboards that was slate now I think they actually sort of Polish those serves to get a really spike but I remember being on a field trip over and Wales in going into a quarry where they were actually making slaves for roots and these guys would you sitting there with a chisel hammer and splitting off these these slabs that were perfectly uniform upon a court of age tape beautifully smooth on one side this was characteristic of slaty cleavage know if we squeeze a little bit more below that words close and I use that fair enough if you squeeze little bit more now that Mike is no longer stable is probable that change to something else maybe cord but other things are going to start happening for example there's gonna be start reactions now and then there's going to be people dimensional crystals form not platy minerals may be things like Garnet and now for example in between these sheets now they're gonna be places they're gonna be garnets in here so now you try to split it it was put into layers all right but they will be uniform in thickness and will be little rougher and not quite as smooth will be called at flitting cleavage solidi because the the rock now is a phillott know that all the change in composition now we have a fill light now if you keep the squeezing going on pretty soon you start making more and more and more of those non platy minerals 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