Here are excellent articles on the Orisha Yemaya.
And here is an invocation translated by Caroline Dow:
“Yemanjá, Queen of the Earth, Goddess of the Sea. The Crown that our Lord Oxalá* has conferred upon you brings love and happiness. Beautiful Lady, come to me. All hail! Goddess of Prosperity, I invoke you to descend to this earthly plane and visit me, o thou Queen of the Earth, Goddess of the Sea!”
Here are Caroline Dow’s articles on Yemaya:
Fiercely Bright One 
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