Assertion: biotite | /r/HasProperty | black
Facets:
value: , platy
type: OTHER
value: to brown in color
type: OTHER
value: typically
type: DEGREE
value: sometimes
type: TEMPORAL
Source sentences:
text: Quartz is milky white, feldspar is white, potassium feldspar is pink, biotite is black or brown, muscovite is yellow, and amphibole is green.
text: Biotite is also sometimes called "black mica" as opposed to "white mica" (muscovite) –
text: Biotite, a black mica mineral group, is also formed through a metamorphosis when argillaceous rocks exposed to heat and pressure to form schist and gneiss.
text: Hornblende and biotite are both black, but they can be easily distinguished by their crystal form because biotite occurs in sheets, while hornblende forms stout prisms (Figure 2).
text: Perfect basal cleavage as seen in biotite (black), and good cleavage seen in the matrix (pink orthoclase ).
text: Biotite is typically black to brown in color, but it can be difficult to distinguish it from other similarly formed metamorphic rock such as phlogopite, another brown, silicate mica.
text: Granite is made of four minerals, all visible to the naked eye: feldspar (white), quartz (translucent), hornblende (black), and biotite (black, platy).