tions are <code>"calcite"</code>, <code>"aragonite"</code>,
<code>apatite</code>, <code>siderite</code>, and <code>"dolomite"</code>.</p></dd>


<dt>eq</dt>
<dd><p>Equation used for the calculations. See details.</p></dd>

</dl></div>
    <div class="section level2">
    <h2 id="value">Value<a class="anchor" aria-label="anchor" href="#value"></a></h2>
    

<p>Returns the 18O/16O fractionation factor.</p>
    </div>
    <div class="section level2">
    <h2 id="details">Details<a class="anchor" aria-label="a