Noranda drill holes EA-91-09 and EA-91-10 intercepted broad intervals of strong magnetite flooding with K-feldspar and biotite
which indicate the Nighthawk zone is set within an area of intense potassic alteration.
In the complex microprophries is very fine grained with orthoclase, perthite, quartz, biotite
, magnetite, epidote as major minerals.
the total quantity of old stored biotite
reserves is estimated at 25,000 tn, the removal of which will be the natural object of the present.
The granodiorite is of white-green colour containing 30% white quartz crystals, 45% potassic feldspar and 25% biotite
. Both rocks exhibit strong hydrothermal alteration and mineralization (Pyrite, Chalcopyrite and Molybdenite).
These new thick zones of mineralization occur within a quartz, biotite
schist within a zone of about 200 meters long, east-west dimension, and at least 120 meters wide, north-south, and to depths similar to the historic modeled deposit.
extracted from various depths yielded an age of 1600 to 3130 Ma, plagioclase -920 to 2100 Ma, microcline and amphibole 460-1960 Ma.
Large metamorphic minerals (e.g., porphyroblasts such as biotite
, garnet, andalusite and staurolite) that contain passive inclusions are extraordinarily important because they are utilized in assessing the tectonic, metamorphic, and structural history of the mid- to deep-crustal levels of orogenic belts.
Chen et al  reported significant improvements in the digestibility of Ca and P as a result of either 1% or 2% Biotite
V (aluminosilicate clay) supplementation.
The basement consists of Jurassic and Cretaceous biotite
granites and granite porphyry which are covered by Miocene volcanic and Holocene and Late Pleistocene fluviodeltaic sediments (Figure 2) .
In addition to the altitudes of the various peaks, passes, and camps initially provided by the 1921 survey, this chromolithograph map, published in the Geographical Journal in October 1925, displays the three key geological 'units' which Odell identified, namely the Lower Calcareous series, Gneissose Biotite
series, and Upper Calcareous series, as well as two faults of the mountain's northeast-trending ridge.
We notice that in the above mentioned reports the potassium extraction (~75%) is not ideally high and there exist impurities in analcime (microcline and biotite
) caused by the incomplete decomposition of microcline and indissolubility of biotite
in alkaline aqueous, which will hinder the practical industrial application.
Whereas phosphatic rocks are feedstock for both conventional and unconventional phosphate fertilizers, potassium silicates, such as feldspars, biotite
, phlogopite, and muscovite, and rocks with feldspathoids, such as leucite, nepheline and clayrich sediments, especially illite, are the basis for alternative potassium fertilization (Straaten, 2010).