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<p>[QUOTE=&quot;kyratango, post: 799934, member: 5006&quot;]Blue John can be brown<img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie56" alt=":jawdrop:" unselectable="on" unselectable="on" /></p><p>From here:</p><p><a href="https://www.avantijewellers.co.uk/about-derbyshire-blue-john-i56" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://www.avantijewellers.co.uk/about-derbyshire-blue-john-i56" rel="nofollow">https://www.avantijewellers.co.uk/about-derbyshire-blue-john-i56</a></p><p>&quot;Blue John is renowned for its banding stripes but it can vary greatly from very dark blues, to purples to yellow, white and even brown. Blue john is a crystallised formation and therefore sometimes marks can also be seen on the surface of the stone&quot;</p><p><br /></p><p>What leads me towards it is:</p><p>The cristalline texture of the lightest bands on the outer parts.(BJ is a crystalised feldspar) I did some work on your pics to enlight these:</p><p>[ATTACH=full]191646[/ATTACH] </p><p>[ATTACH=full]191647[/ATTACH] </p><p>The slight fluorescence under black light.(BJ is fluorite)</p><p>The scuffed surfaces. (BJ is 4 on the Mohs scale)</p><p>The Victorian era, British location of KSW (if I remember well<img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie29" alt=":bucktooth:" unselectable="on" unselectable="on" />).</p><p><br /></p><p>[USER=8708]@KSW[/USER], could you try a scratch test on back,</p><p>using either a glass shard or a knife blade as this useful list says:</p><p>[ATTACH=full]191648[/ATTACH] </p><p>Impatient to see your update <img src="styles/default/xenforo/smilies/wink.png" class="mceSmilie" alt=";)" unselectable="on" /><img src="styles/default/xenforo/smilies/smile.png" class="mceSmilie" alt=":)" unselectable="on" />[/QUOTE]</p><p><br /></p>

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