Video 8.1 Spinel M26

<p><strong>Video 8.1 Spinel M26 </strong>LA-ICP-MS trace element accessory mineral maps, Trondheimskleber sample RC180405 &nbsp;</p> <p>In these maps, the darkest purple colours indicate very low (or absent) concentrations of the element for that map. With increasing concentrations of that element, the colour changes across the spectrum from purple through blue, with the brightest cyan tones indicating "very high" concentrations of that element, with respect to the total amounts of that element measured for each sample. For the trace elements the highest concentrations may be only a few ppm, yet still be represented by the bright blue shades for one or more crystals, in contrast to the total absence (very dark purple to black), or much lower levels (brighter purple) of the other crystals analysed. Therefore, the below list of element concentration maps included in this film also indicates which of these elements are the major elements (dominate) of a given crystal, and which are trace elements. &nbsp;</p> <p>The video sequence (approximate times) is: &nbsp;</p> <ul> <li>00:00 The locations of Klungen and Bakkaune steatite quarries</li> <li>00:10 Trondheimskleber hand sample RC180405 from either lungen or Bakkaune quarry</li> <li>00:12 reflected light image of the network of Fe-oxide crystals, two spinel crystals, and the matrix minerals analysed as map M26,</li> <li>00:14 Cr (minor amounts in the spinel crystals, trace amounts in the Fe-oxide, absent in the matrix minerals)</li> <li>00:17 Fe (dominate in the Fe-oxide and spinel crystals)</li> <li>00:19 Co (trace amounts, concentrated in the core of one of the spinel crystals and higher in the chlorite than in the Fe oxide)</li> <li>00:22 V (trace amounts in both the Fe-oxide and the spinel)</li> <li>00:24 Al (dominate in the chlorite)</li> <li>00:26 Zn (trace amounts, only in the core of the spinel crystal)</li> <li>00:28 Mn (trace amounts, concentrated in the spinel core, slight lower in the chlorite, and absent in the Fe-oxide)</li> <li>00:30 Mg (dominate in the chlorite and talc, absent in the spinel and Fe-oxide).</li> <li>00:34 the reflected light image of the crystals (repeated)</li> <li>00:36 A collage of all of those maps surrounding the reflected light image.</li> </ul>