Mineral : Tectosilicates - Plagioclase Feldspars

Luster - vitreous
Streak - white
Hardness - 6-6.5
Density - moderately low density
Cleavage - two planes @ 90 degrees
Color - variable, white-grey-dark, labradorescence
Crystal system - triclinic
Crystal form/habit - blocky, massive
Extra notes - you can expect visible lamallae that are very straight, and a play of colors in labradorite

[@kmacdowe]

30 years I have been waiting for someone to do this. Thanks!

[@HoboMinerals]

I learn better with visuals, thank you!

[@andoniades]

Thanks for the video! Does the Anorthite effervesce in HCl due to it's Ca in it's chemical formula? Thanks!

[@jt21419]

It's calcium carbonate that fizzes, not calcium per se.

@@jt21419 Carbonates react with HCl, regardless of Ca existence.

[@iamisisamunra933]

Who else trying to pass their geology exam?

[@fuzzzeballs]

you videos are just better