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Pink transparent stone it maybe obsidian but my research indicates pink colour is very unusual for obsidian

It’s translucent, all pink, slightly refractive you can read letters through when stone is close to letters but not at a distance of 10cm. Cuts or scratches glass fairly easily. Has no bubbles. Very smooth clean polished texture on the broken surfaces. Found on a field in London.

the rock

[Fifty pence coin][1] shown for scale, 27.3mm in diameter

[1]: https://en.wikipedia.org/wiki/Fifty_pence_(British_coin)enter image description hereenter image description hereenter image description here

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    $\begingroup$ I'm glad you want to participate, but we need more information in order to answer this. Please read this guide and edit in as much as you can. $\endgroup$ – Spencer Sep 11 '18 at 10:26
  • $\begingroup$ What coin is that next to the sample? $\endgroup$ – Mason Wheeler Sep 11 '18 at 15:05
  • $\begingroup$ @MasonWheeler - Fifty pence coin. I was tempted to be sarcastic and point out that it says "fifty pence" on it, but thinking about it further it's probably easy for me to read because I already know what it says. Link added (suggested edit) to explain. $\endgroup$ – AndyT Sep 11 '18 at 15:11
  • $\begingroup$ Yeah. I can clearly see that it says "50" at the bottom, but the text "fifty pence" along the top isn't really legible until it's pointed out what it says. $\endgroup$ – Mason Wheeler Sep 11 '18 at 15:29
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This is artificial glass. Pink transparent obsidian does not exist in nature, despite what some people who sell it say.

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  • $\begingroup$ And while quartz may be that colour on occasion it doesn't have the same fracture behaviour and glass. $\endgroup$ – Ash Sep 11 '18 at 12:44
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    $\begingroup$ @Ash indeed. Whilst quartz does have conchoidal fracture, it is much harder to break and it will show signs of abuse. This specimen has nice and clean fractures, and if it was indeed rose quartz, why tf would anyone break it? In addition, the top shows a curved unbroken surface, which is not characteristic of quartz. Therefore, this is glass. $\endgroup$ – Gimelist Sep 11 '18 at 12:49
  • $\begingroup$ Thanks, I was hoping it was something different cause it does cut or scratch smooth glass fairly easily ? $\endgroup$ – J.e Sep 17 '18 at 8:17
  • $\begingroup$ @J.e well, glass can scratch glass. $\endgroup$ – Gimelist Sep 17 '18 at 10:40

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