Chris White<p>Twinned <a href="https://sciencemastodon.com/tags/feldspar" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>feldspar</span></a> crystals<br>In a paving stone in <a href="https://sciencemastodon.com/tags/Exeter" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Exeter</span></a>, United Kingdom, pound coin for scale.<br>Must have cooled slowly, allowing large crystals to grow, so <a href="https://sciencemastodon.com/tags/intrusive" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>intrusive</span></a>, not <a href="https://sciencemastodon.com/tags/extrusive" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>extrusive</span></a> / <a href="https://sciencemastodon.com/tags/volcanic" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>volcanic</span></a>.<br>My <a href="https://sciencemastodon.com/tags/photo" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>photo</span></a> of an <a href="https://sciencemastodon.com/tags/igneous" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>igneous</span></a> <a href="https://sciencemastodon.com/tags/mineral" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>mineral</span></a> because I like <a href="https://sciencemastodon.com/tags/geology" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>geology</span></a></p>