Specular haematite forms a constituent of certain schistose rocks, such as the Brazilian itabirite.
The quality of ore in the two ranges differs somewhat, that mined from the Vermilion Range being a hard specular or red haematite, while that taken from the Mesabi Range, largely red haematite, is much softer and in many localities quite finely comminuted.
The splendent surface has suggested for this mineral such names as specular iron ore, looking-glass ore, and iron glance (fer oligiste of French writers).
Micaceous iron ore consists of delicate steel-grey scales of specular haematite, unctuous to the touch, used as a lubricant and also as a pigment.
The ore occurs in two forms, haematites and limonites; the specular hematites often being grouped, for practical purposes, into two classes - those occurring in porphyry and those occurring in sandstone.
Volcanic activity in the neighbourhood is further shown by the quantities of pumice-stone drifted on to the south coasts of Kandavu and Viti Levu; malachite, antimony and graphite, gold in small quantities, and specular iron-sand occur.
Specular iron ore occurs in the form of brilliant metallic scales on many lavas, as at Vesuvius and Etna, in the Auvergne and the Eifel, and notably in the Island of Ascension, where the mineral forms beautiful tabular crystals.
In the Marquette district of Michigan (Lake Superior) schistose specular ore occurs in important deposits, associated with a jasper rock, in which the ore alternates with bands of red quartzite.
Ferric oxide or iron sesquioxide, Fe203, constitutes the valuable ores red haematite and specular iron; the minerals brown haematite or limonite, and gothite and also iron rust are hydrated forms. It is obtained as a steel-grey crystalline powder by igniting the oxide or any ferric salt containing a volatile acid.
even glossy metal targets can be stably detected by ignoring the influence of specular reflection.
In order to get good detail out of the shadows the exposure has just clipped the specular reflections.
specular highlights on a totally black object.
specular It's beyond the scope of this FAQ to explain what specular lighting is.
specular X-ray reflectivity, diffraction imaging and defect mapping.
specular surface is of high curvature the light will be tend to be focused.
specular reflectance accessory.
Glass has highly specular surface characteristics at high glancing angles and polarized luminaires adjacent to extensive glazing should be avoided.
Specular and diffuse scattering profiles were collected from the rhodonite surface after each stage.
You cannot get specular highlights on a totally black object.
Specular It 's beyond the scope of this FAQ to explain what specular lighting is.
The second section delves into the techniques and theory behind the applications such as specular X-ray reflectivity, diffraction imaging and defect mapping.
If the specular surface is of high curvature the light will be tend to be focused.
This is done with a VW specular reflectance accessory.
The word usage examples above have been gathered from various sources to reflect current and historial usage. They do not represent the opinions of YourDictionary.com.