Furthermore, their model included a second mineral called biotite, surrounding a zircon core.    From Wordnik.com.  [Reasons to Believe -] Reference

Black biotite contains potassium, iron, and magnesium.    From Wordnik.com.  [Mica] Reference

Cape Maclear at the north end is rocky, predominantly biotite-granite.    From Wordnik.com.  [Lake Malawi National Park, Malawi] Reference

The mica group of minerals includes: biotite, muscovite, lepidolite, and phlogopite.    From Wordnik.com.  [Vermiculite] Reference

In the granite, pyroxene has been partially converted (supra-solidus) to Fe-rich biotite.    From Wordnik.com.  [Granophyre.html] Reference

Vermiculite is formed by the alteration and/or weathering of the minerals biotite and phlogopite.    From Wordnik.com.  [Vermiculite] Reference

Dacite and granodiorite contain slightly more biotite and amphibole minerals than granite and rhyolite.    From Wordnik.com.  [Igneous rock] Reference

We pushed the ship against a small banded berg, from which Wordie secured several large lumps of biotite granite.    From Wordnik.com.  [South: the story of Shackleton’s last expedition 1914–1917] Reference

Assays of 0.1 to 0. 5% U3O8 are present in a brecciated biotite rock.    From Wordnik.com.  [Marketwire - Breaking News Releases] Reference

In other minerals the measurements are not quite the same as in biotite.    From Wordnik.com.  [The Birth-Time of the World and Other Scientific Essays] Reference

The radii in biotite of the several spheres are given in the following table.    From Wordnik.com.  [The Birth-Time of the World and Other Scientific Essays] Reference

The wall rock for these veins is usually either biotite mica schists or schistose gneiss.    From Wordnik.com.  [North Carolina and its Resources.] Reference

Mica — A group of minerals, including muscovite or "isinglass" and biotite or black mica.    From Wordnik.com.  [Tseh So, a Small House Ruin, Chaco Canyon, New Mexico :] Reference

There is some sericite present, also magnetite, resulting from the decomposition of the biotite.    From Wordnik.com.  [The Long Labrador Trail] Reference

We see in the photograph (Pl. XXIII, lower figure), much magnified, a halo contained in biotite.    From Wordnik.com.  [The Birth-Time of the World and Other Scientific Essays] Reference

The heavy iron atom of the biotite is, doubtless, chiefly responsible for this in biotite haloes.    From Wordnik.com.  [The Birth-Time of the World and Other Scientific Essays] Reference

MICA (another group, primarily the minerals muscovite and biotite) comprises about 8\% of the crust.    From Wordnik.com.  [Netvouz - new bookmarks] Reference

The stone is fine grained biotite granite, for the most part containing little or no injurious material.    From Wordnik.com.  [North Carolina and its Resources.] Reference

Sericite alteration is ubiquitous within the sheared rocks, and fuchsite and biotite have been observed locally.    From Wordnik.com.  [The Earth Times Online Newspaper] Reference

The Elden breccia features abundant secondary K-spar alteration, secondary green biotite, and hydrothermal silica.    From Wordnik.com.  [TradingMarkets] Reference

The hole ended in fresh, unaltered, non-uranium-bearing garnet biotite gneiss at a drill core length of 375 metres.    From Wordnik.com.  [Marketwire - Breaking News Releases] Reference

This hole ended in fresh, unaltered, non-uranium-bearing garnet biotite gneiss at a drill core length of 404 metres.    From Wordnik.com.  [Marketwire - Breaking News Releases] Reference

Aside from silicate hosts (biotite and hornblende), uraninite is intergrown with pyrrhotite, molybdenite, and zircon.    From Wordnik.com.  [Digital50.com Digital 50 Daily Industry News RSS Feed] Reference

The Front West vein was intersected from 81. 15m to 81. 35m (core length) in an altered diorite (biotite-calcite-chlorite).    From Wordnik.com.  [Marketwire - Breaking News Releases] Reference

In most of the cases mentioned above the structure evidently shows the existence of concentric spherical shells of darkened biotite.    From Wordnik.com.  [The Birth-Time of the World and Other Scientific Essays] Reference

The Lac Pivert and Rose properties host pegmatites that occur as irregular but generally continuous lenses within the biotite schists.    From Wordnik.com.  [The Earth Times Online Newspaper] Reference

The McDowell structure was intersected from 195. 36m to 195. 97m (core length) in a strongly altered (biotite-calcite-chlorite) diorite.    From Wordnik.com.  [Marketwire - Breaking News Releases] Reference

The McDowell structure was intersected from 179. 95m to 181. 75m (core length) in a strongly altered (biotite-calcite-chlorite) diorite.    From Wordnik.com.  [Marketwire - Breaking News Releases] Reference

Continued temperature decreases change the minerals dominating the composition of the rock from pyroxene, to amphibole, and then biotite.    From Wordnik.com.  [Featured Articles - Encyclopedia of Earth] Reference

To the east, biotite gneiss is more common.    From Wordnik.com.  [Ecoregions of Alabama and Georgia (EPA)] Reference

These are the measurements in biotite.    From Wordnik.com.  [The Birth-Time of the World and Other Scientific Essays] Reference

These are always the measurements in biotite.    From Wordnik.com.  [The Birth-Time of the World and Other Scientific Essays] Reference

Otto "biotite Scientific Biotechnology Laboratory.    From Wordnik.com.  [WN.com - Articles related to Pregnant women can enjoy one cup of coffee a day] Reference