Rutile
TiO₂

Rutile, a member of the rutile group, is fairly common at the locality.

PHYSICAL CHARACTERISTICS:

Color is usually black, very rarely red or brown.
Luster is submetallic to adamantine.
Diaphaneity is opaque to translucent.
Crystal System is tetragonal; P4₂/mnm.
Crystal Habits include blocky or short prismatic to 6mm, equant curved
   crystals to 2mm, elongated prisms to 1.2cm and oriented acicular
   crystals forming reticulated aggregates.
Cleavage {110} is distinct, {100} is indistinct.
Fracture is concohidal to uneven.
Hardness is 6 - 6.5
Specific Gravity is approximately 4.2 g/cm³.
Streak is pale brown.
Associated Minerals include albite, anatase, bastnäsite, calcite, chlorite
   group, dolomite, epididymite, fluorapatite, microcline, natrolite, pyrite,
   pyrochlore, pyrophanite, pyrrhotite, quartz, siderite and synchysite.
Distinguishing Features: Crystal habit and luster.
Origin: Named in 1803 from the Latin rutilas, golden red, alluding to its
   common color, especially in transmitted light.