Site icon Seashells by Millhill

Why So Many Black Seashells?

lettered olive with other seashells

Lettered olive shell, with center part missing

Seashells come in many lovely colors, but it’s odd to find all black seashells. Certain shells have dark lines or spots and are made that way by the snail inside, but this is different. One day while collecting shells, I found an unusual number of all-black shells.

Sometimes out in the wild a living shell, or shell still under the water, will be covered in a dark, sometimes fuzzy, coating. That is the periostracum, or skin, which creates an outer layer over the shell. I have a horse conch which I cleaned, but never removed all that layer. The shell underneath was still light colored.

But some shells, like these Jingle shells, are all black.   They may have begun as some pretty orange or white color, but have turned black due to the sediment where they were buried. It has to do with sulfur content in the sand, or something. I am no scientist, so I won’t try to explain the process – I would just confuse myself and you! My message here is that they don’t begin black.

These jingle shells were collected near Ponce Inlet on the East coast of Florida.  You can see that one of them (in the photo above) is just beginning to turn from it’s light orange color.  It may not have been buried as long as the others.  Constant wave action is bound to unearth shells and eventually wash them ashore.

Below, I have worn oyster shells and piece of something that was probably a whelk among the ridged jingle shells.

The partial whelk shell below has also turned black.  These shells do not start out this way.  Whelks are generally tan with brown stripes or light in color.  The one in my photo below is probably either a Lightning Whelk or Knobbed Whelk.  It’s too broken for me to tell.


Shells are often not pretty when found. Especially if they are found in the water. They can be dark or coated with green, with barnacles or oysters attached. Shells found up on the sand can be white, or much lighter in color that they were when inhabited. The sun can bleach them. This makes seashell identification harder. It can be just as difficult when collecting shells that have turned totally black.

LATEST POSTS

A Sunday Drive On The Beach

My youngest son was here visiting and wanted to go to the beach. Unfortunately the only day we could go was on a weekend. Late morning Sunday we packed the truck and headed to New Smyrna Beach. It should have taken about 10 minutes to get onto the beach, but took more like 45. Some…

Snatched Up A Sweet Camping Spot at Gamble Rogers!

Even before we owned a camper, I knew that Gamble Rogers campground was difficult to get into. Some of the campsites are right on the ocean, and lots of people want to camp on the ocean. My son is a fire fighter and we schedule our short camping trips around his days off. When I…

Loading…

Something went wrong. Please refresh the page and/or try again.

Exit mobile version