quartz or mica
Foliation
The schists constitute a group of medium-grade metamorphic rocks, chiefly notable for the preponderance of lamellar minerals such as micas, chlorite, talc, hornblende, graphite, and others. Quartz often occurs in drawn-out grains to such an extent that a particular form called quartz schist is produced. By definition, schist contains more than 50% platy and elongated minerals, often finely interleaved with quartz and feldspar.
cleave
It depends on how soft the mineral is. For example, Talc is the softest mineral. You can scratch it with just a fingernail. but on the other hand, Diamond, the hardest mineral can only be scratched with another Diamond. So as long as you are not trying to scratch a diamond (it would be 50/ 50 change of scratching if use another diamond), use a diamond. NOTE: how easy it is to scratch a mineral has nothing to do with how easy it is to break a mineral. Example diamond is the hardest mineral but can be chipped or broken by a good strong hammer stroke.
The streak of a mineral refers to the color left on a streak plate after rubbing a mineral across its surface. A streak plate can be as simple as the unglazed side of a porcelain tile. The streak is the mineral in a powdered form from abrasion with the hard, slightly textured surface of the unglazed porcelain streak plate. The streak color may differ from the color observed in a specimen. The streak is used as an aid in the identification of minerals.
Foliation
Strong metals and jewelry.
SchistMedium- to coarse-grained, mica-bearing metamorphic rock with well-developed foliation (layered structure) termed schistosity. Schist is derived primarily from fine-grained, mica-bearing rocks such as shales and slates. The schistosity is formed by rotation, recrystallization, and new growth of mica; it is deformational in origin. The planar to wavy foliation is defined by the strong preferred orientation of platy minerals, primarily muscovite, biotite, and chlorite. The relatively large grain size of these minerals (up to centimeters) produces the characteristic strong reflection when light shines on the rock.For the source and more detailed information concerning this subject, click on the related links section (Answers.com) indicated below.
The schists constitute a group of medium-grade metamorphic rocks, chiefly notable for the preponderance of lamellar minerals such as micas, chlorite, talc, hornblende, graphite, and others. Quartz often occurs in drawn-out grains to such an extent that a particular form called quartz schist is produced. By definition, schist contains more than 50% platy and elongated minerals, often finely interleaved with quartz and feldspar.
Not all mineral acids are strong acids.
Mineral acids are strong acids.
Spar
calcium
Viagra.
calcium
Calcium
phosphorus