Stone carving

I'm guessing wildly here but this looks to me like a light switch plate except without any holes to mount it. It's a very dark mottled green stone - malachite? Is it Mayan? Inherited from my mom who may have had it 50 yrs or so. It's 9 1/2" long, 4" wide and about 1/2" thick. Feels cold and heavy. Would love to know anything about it and any ballpark value as a charitable donation (less than $50, more than $100, millions???)
Thanks!

 

Hello, mired. Green serpentine would fit the bill. If you think you saw basalt here, erase it from your mind.

 

Your object is a decorative reproduction of a pre-columbian Peruvian "tumi" knife. I suspect it may be made of a cast stone + resin composite, but I am not sure. I just can't see anyone taking the time to actually carve such an item.

This is a real one:

Sican-style Tumi, 750-1100 AD, from the north coast of Peru, gold with turquoise, exhibited in the Art Institute of Chicago

They are popular as souvenir/decorative motifs:

https://www.etsy.com/no-en/listing/643940419/peru-inca-mesoamerican-el-tumi-knife

 

This is why we need better closeups of material on both sides, it might help to make a determination on this.

 

Back in the 60s-70s there were popular reproductions of the Mexican "Aztec Calendar" made using a stone composite, very similar in color and appearance.

 

An inexpensive souvenir.

Debora

 

Wow you guys are the bomb!!! So many answers so fast. Thanks a million!

 

https://www.google.ch/search?q=inca...mg&ei=1BvuXs_9F4P_lwSnt5bADA&bih=535&biw=1184

 

With your help I found this on Ebay - looks almost identical: https://www.ebay.com/itm/VINTAGE-CA...rentrq:d291b0a01720aa1385f989befff7384c|iid:1

 

@MIRED - The seller you found has maybe some unrealistic expectations. Here are sold listings for tumi ceremonial knife.

https://www.ebay.com/sch/i.html?_fr...al+knife&LH_Sold=1&LH_Complete=1&_dmd=1&rt=nc

 

I think you're right, it's way overpriced. But since it means "good luck" maybe that's what the seller is betting on