Prunus spp. of the family Rosaceae, including at least 7 different species in that genus. In addition to that, there are another 3 dozen or so species from about 20 genera that ALSO have the word almond as all or part of one or more of their common names, so there's a lot of room for confusion.
my samples: NOTE: these pics were all taken in very bright incandescent lighting --- colors will vary under other lighting conditions
both sides of a sample plank of almond / Prunus amygdalus --- HUGE enlargements are present. This sample was loaned to me by David Clark whom I thank for this and other contributions to the site.
end grain and end grain closeup of the piece directly above