Description: Up For Auction. Rare Cumberlandite White on top is dead mossRhode Islands State Rock. Cumberlandite is found in Cumberland RI.Blackstone Valleylargest and only known major deposit is thereSelf Collected 12/18A1,A2 etc are for my records only.Cumberlandite its major chemical make up is:Ilmenite,Magnetie and olivineThe following may or may not be present:Feldspar,plagioclase,labradorite and Spinel.There are 3 different classifications of Cumberlandite:(1) Monotonuous Cumberlandite - no white plagioclase crystals(2) Ornament Cumberlandite - varying white plagioclase crystals(3) Tenuous Cumberlandite - greenish plagioclase crystals Petrology:The rock is an uncommon mafic igneous rock known as a troctolite. It is black with phenocrysts of plagioclase in a medium grained matrix of magnetite, ilmenite, olivine and hercynite spinel. The abundance of magnetite and ilmenite, which may be up to 70 percent of the rock, is responsible for the high density and magnetic property. Locally the parallel orientation of the lathlike plagioclase crystals gives the rock a flow lamination. The rock is part of the Esmond-Dedham Subterrane with an uncertain age from Late Proterozoic to Devonian.[1]1. Mineral Resources Spatial Data and Geology: Rhode Island; United states Geological SurveyThanks for lookingand please look closely at photo(s) before biddingI will combine shipping. However please wait to pay until I can figure out shipping cost.
Price: 14.99 USD
Location: Millbury, Massachusetts
End Time: 2025-01-21T15:50:27.000Z
Shipping Cost: N/A USD
Product Images
Item Specifics
All returns accepted: ReturnsNotAccepted
