Table of Contents

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Introduction

The X-Ray Laboratory onboard the JOIDES Resolution performs diffraction analyses of minerals and rock powders using a D4 Endeavor XRD from Bruker AXS. Associated software, DIFFRACplus and TOPAS, allow for analysis of minerals and rock powders; including peak-matching and mineral & chemical compound identification. The XRD lab provides scientists with a quick and reliable tool for mineral identification; it is particularly useful for identifying fine-grained minerals or mixtures of alteration minerals that cannot be easily identified with other techniques onboard. XRD can also be used to determine the proportions of minerals present.

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Glacial acetic acid (_{100%) is highly dangerous. It can cause severe tissue damage on contact. Always add acid to water! When mixed with water, glacial acetic acid liberates large quantities of heat, so appropriate care should be used when diluting this compound. Glacial acetic acid is also a flammable liquid and should be stored away from oxidizers (e.g., HNO}3{~}). When diluted to ~10% concentration, it is very similar to white vinegar, so while it is still acidic and could cause tissue damage, it is not as hazardous.

Credits

This document originated from Word document XRD_QSG_374.doc (see Archived Versions below for a pdf copy) that was written by H. Barnes and K. Bronk; later edited by N. Lawler and A. Armstrong. Credits for subsequent changes to this document are given in the page history.

Archived Versions