Rarest variety of chrysoberyl. It appears red in incandescent light and green in sunlight.

Which of the following is not included in Pre-Cretaceous metamorphic rocks in the PH

World's most valuable black opal. Found in 1938 at Lightning Ridge as a harlequin pattern with dominant red, green, blue and blue colors against a black background.

Chromium-bearing garnet

Which of the following is an ore of Cadmium

Crystal System of Luzonite

Also known as yellow ratsbane

Which of the following is not an ore mineral of lead

Which of the following is not an ore mineral of Niobium

40-70% DCM (Dark Colored Minerals) according to Hyndman,1985

Relative abundance of Aluminum oxide with unsually hugh Na2O & K2O

Partial melting of Basic magma yields ___________

Magma series that is enriched in FeO,SiO2 and alkali elements and depleted in MgO & CaO. Generated primarily at ocean spreading centers and produce large volume of basalt with subtle composition variation.

Type of granite with SiO2 = 65-79%, Na2O= low, <3.2%, K2O/Na2O = high, Sr87/Sr86 = >0.706

Iron-potassium phyllosilicate mineral. Normally considered a diagnostic mineral indicative of continental shelf marine depositional environments with slow rates of accumulation

Which of the following will not favor feldspar preservation

Facies series with <10C/km geothermal gradient

Low P equivalent of Amphibolite facies; T=450-600C; P=<2.5kbar; depth = <8km.

Groundmass contains little volcanic glass and consist predominantly of minute tabular crystals

Secondary texture consisting of irregular "wormy" blebs or rods of quartz in a plagioclase host adjacent to alkali feldspar grains

Having large pyroxene grains enclosing small, random plagioclase laths

Olivine basalt

The crystallographic axes are 3 in number. They make 90° angles with each other and are of unequal lengths. Any 1 of the 3 axes may be chosen as the vertical or c-axis. The longer of the 2 is taken as the b-axis (macro-axis) and the shorter is taken as the a-axis (brachy-axis).

The crystallographic axes are 3 in number. They are of unequal lengths. The axes a and b, b and c, make 90° angles with each other. The a-axis is known as the clino-axis, while the b-axis is known as the ortho-axis.