This specimen came from a rathyer funny field trip to the mine. Our young son (Then around 7 years old) was with us. It had been raining the night before and the ground was very wet. The guide gatherred us all and advised us to try and avoid the puddles of black water as it would stain our clothing, as he was explaining I saw our young man splashing in one of the puddles.... needles to say the guide was right, the stains do not come out of the clothing! We found a good few of these and always thought they where rather unique. Packed shipping weight 140gr.
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