black sand

noun

Definition of black sand

:dark-colored sand
  • a black sand beach
  • Along the coast the sea gnaws at the twisted lava, and eventually reduces it to “black sand.”
  • —Cheryl SimonScience News9 July 1983
; specifically :dark sand containing small fragments of magnetite usually found as part of an geological deposit
  • Slow down as black sand begins to accumulate in the bottom of the pan, and watch for any gold that might move up toward the rim of the pan.
  • —Alan M. CvancaraA Field Guide for the Amateur Geologist1995
Note: Deposits of black sand are often signs of valuable resources such as gold, rare earth elements, or gems.

There's more!

Love words? You must — there are over 200,000 words in our free online dictionary, but you are looking for one that’s only in the Merriam-Webster Unabridged Dictionary.

Start your free trial today and get unlimited access to America's largest dictionary, with:

  • More than 250,000 words that aren't in our free dictionary
  • Expanded definitions, etymologies, and usage notes
  • Advanced search features
  • Ad free!
Already a subscriber? Log in.

First Known Use of black sand

circa 1550


Black Sand

adjective

Definition of Black Sand

:of or relating to a component of Woodland culture and a physical type first found in central Illinois

Origin and Etymology of black sand

so called from the glacial sand of the Illinois river flood plain near Liverpool, Illinois, where remains were found


Seen and Heard

What made you want to look up black sand? Please tell us where you read or heard it (including the quote, if possible).

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!

WORD OF THE DAY

to buzz or drone

Get Word of the Day daily email!

Test Your Vocabulary

Find the Cousins

  • a-large-tree-with-many-branches
  • Which pair shares a common word ancestor?
Spell It

Can you spell these 10 commonly misspelled words?

TAKE THE QUIZ
Bee Cubed

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!