Australian Facetors' Guild Limited

From Wikipedia:  Labradorite occurs in mafic igneous rocks and is the feldspar variety most common in basalt and gabbro.

Sunstone:  The feldspar which usually displays the aventurine appearance is oligoclase, though the effect is sometimes seen in orthoclase: hence two kinds of sunstone are distinguished as "oligoclase sunstone" and "orthoclase sunstone".

Moonstone:  Moonstone is a sodium potassium aluminium silicate of the feldspar group that displays a pearly and opalescent schiller. An alternative name is hecatolite. Wikipedia.  

Labdorite appears to be a bastardised name for the "sunstone" from Springsure.   Though the references to this name is numerous in the jewellery world, particularly Kartique jewellery which calls the formerly known as Labradorite from Norway, Finland and Canada as Labdorite.

How long do we work around this confusion? 

The confusion in terminology will continue as long as people freely change names to suit themselves. In the case of the labradorite from Springsure and Hogarth Range, chemical analysis proved that it was, in fact labradorite, even though it looks nothing like the original naming material from Newfoundland. I believe, however, that it is wrong to call it sunstone, when it does not have the inclusions that give the sunstone effect, that we see in the feldspar from Harts Range, for example.

One thing I have never seen is a good explanation of the reason that the Hogarth Range and Springsure material managed to crystallise in a uniform composition, instead of the alternating layers of changing composition that give the colour effects in the original Newfoundland material.