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Agate

The stone was given its name by Theophrastus, a Greek philosopher and naturalist, who discovered the stone along the shore line of the river Achates.  Agate derives from the Chalcedony family and is the banded form.  It is the most varied form and has many varieties far to many to list here.  Although the pattern on every Agate is unique, the locality of an Agate will provide resemblances in banding style and color, thus lending many Agates with a geographic prefix.  

Agate usually forms in rounded nodules which need to be sliced open to bring out the internal pattern hidden in the stone. Much of the Agate sold to collectors has been treated, in the form of tumbled stones or polished slabs. Agate is often dyed to enhance its colors. This is especially true of Agate from Brazil. Bright neon colors such as bright blue and red are rarely natural.

Agate has a Mohs hardness scale of:-  6.57

Its natural colours vary from white to grey, light blue, orange to red, black and banded and because of its hardness its perfect for use in everyday jewellery.
- See more at: http://www.minerals.net/mineral/agate.aspx#sthash.knJebMCQ.dpuf
Agate usually forms in rounded nodules or knobs which need to be sliced open to bring out the internal pattern hidden in the stone. Most Agate is ugly in its natural state; specimens must be polished to bring out their full beauty. Much of the Agate sold to collectors has been treated, in the form of tumbled stones or polished slabs. Popular collector forms of Agate include nodules or geodes sliced in the middle into two polished cross-sections, or thin slabs from nodule or geode cross-sections - See more at: http://www.minerals.net/mineral/agate.aspx#sthash.knJebMCQ.dpuf
Agate usually forms in rounded nodules or knobs which need to be sliced open to bring out the internal pattern hidden in the stone. Most Agate is ugly in its natural state; specimens must be polished to bring out their full beauty. Much of the Agate sold to collectors has been treated, in the form of tumbled stones or polished slabs. Popular collector forms of Agate include nodules or geodes sliced in the middle into two polished cross-sections, or thin slabs from nodule or geode cross-sections - See more at: http://www.minerals.net/mineral/agate.aspx#sthash.knJebMCQ.dpuf

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