St. John Sand

St John Sand
Magnified image of St. John Sand

A magnified view of the tropical beach sand from the Caribbean island of St. John (U.S. Virgin Islands). The grains include porous fragments of brightly-colored corals, minute foraminiferan shells, fragments of sea shells and shiny, star-shaped sponge spicules…. waynesword.palomar.edu

See Also: A Grain Of Sand Video by Dr. Gary Greenburg

Where does our sand come from?
The sand found on St. John’s beaches comes, almost entirely, from the coral reef community. This is the main reason why our sand is so much finer and softer then the sand found on most continental beaches, which comes from terrestrial sources, such as the weathering of rocks.

Most of the sand on St. John’s beaches is produced by the force of waves and currents acting on the coral reef as coral, calcareous algae, (algae with a hard exoskeleton) the shells of various sea creatures and sea urchin spines (which make up those little black grains of sand) are gradually broken down into sand sized grains.

OLYMPUS DIGITAL CAMERAIn addition, reef grazing fish, such as parrotfish, produce a significant amount of the sand found on our beaches. Parrotfish exist on a diet of algae, which they scrape off the surface of coral rock with their fused teeth that look like a parrot’s beak. They then grind this coral and algae mixture to a fine powder. The algae covering the coral are absorbed as food. The remainder of their meal passes through their digestive tracts and is excreted in the form of sand…. read more

St. John Weather

Partly cloudy with rain showers
High of 82 degrees F
Breezy: Winds from the ESE at 15 to 20 mph
Chance of rain 20%
Water temperature (Charlotte Amalie Harbor, St. Thomas): 87.1 degrees F
Sunset: 6:34 PM AST

St. John Live Music Schedule

Aqua Bistro
Lauren Jones
3:30 – 6:30
776-5336

Concordia
Bo
Sunday Brunch 10:00 am

Cruz Bay Prime
Mark Wallace
7:00 – 10:00
693 -8000

High Tide
Lemuel Callwood Steel Pan
4:00 – 6:00
714-6169

Island Blues
Van Gordon Martin
776 – 6800

Miss Lucy’s
Sambacombo
10:00 am – 2:00 pm
693-5254

Ocean Grill
David Laab
6:30 – 9:00
693-3304

Rhumblines
T-Bird
7:00 – 10:00

Shipwreck Landing
Hot Club
7:00 – 10:00

Skinny Legs
Dave Gerard
6:00
779 4982

Sun Dog Cafe
David Laab
11:00 am- 2:00 pm
244-9713

See Weekly Schedule

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