Message:

<p>[QUOTE=&quot;robinjojo, post: 6576955, member: 110226&quot;]Amazing photos!&nbsp; What power lens did you use?</p><p><br /></p><p>The green deposits of malachite deposit appear to be botryoidal (rounded) there appear to be micro crystals of azurite.</p><p><br /></p><p>Botryoidal, a term used in minerology, simply means having a shape reminiscent of a cluster of grapes, a rounded surface deposit.&nbsp; When we&#039;re talking coins, it is the green oxides that can vary in shade.&nbsp; In minerology the copper oxide deposits, such as in The Democratic Republic of the Congo are extensive, and a prime source of copper ore for the world&#039;s economy.&nbsp; </p><p><br /></p><p>Here&#039;s a typical polished example of the malachite from that country:</p><p><br /></p><p>Malachite, Shaba Province, Democratic Republic of the Congo.</p><p><br /></p><p>70mm x 53mm x 31mm</p><p><br /></p><p>286 grams</p><p><br /></p><p>[ATTACH=full]1264390[/ATTACH] </p><p><br /></p><p>As can be seen, the shades of green vary from layer to layer.&nbsp; The darker bands have a higher concentration of copper oxide compared with the lighter bands. Such variation can also be seen frequently on ancient bronze coins.&nbsp; Depending on deposition conditions, green and alter with blue (azurite), and shades between.[/QUOTE]</p><p><br /></p>

Your name or email address:

Do you already have an account?

• No, create an account now.
• Yes, my password is:
• Forgot your password?

Stay logged in