All 6 Uses

although
in
Island of the Blue Dolphins
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Although the entrance to the Coral Cove was too narrow for a ship to pass through safely at night, men were sent there to watch the cove from dusk to dawn, besides those who watched during the day.†
p. 30.6

although = even though -- used to connect contrasting ideas
Many times I had swum farther than this, although not in a storm.†
p. 38.5
With the seeds I had gathered in a ravine, we had a plentiful meal, although I had to cook it on a flat rock.†
p. 40.5
I then got to my feet and fitted an arrow to the bow, although I suddenly remembered my father's warning that, because I was a woman, the bow would break.†
p. 78.5
Although the mouth of the cave was small, once you were inside, it spread out and you could stand up.†
p. 84.5 *
He would put his head on one side and then the other, although he knew only two of the words, and look at me.†
p. 97.4

Definitions:

(1) (although)
even though -- used to introduce an idea that contrasts with or makes the main statement surprising

At the start of a sentence, although can play a role similar to words like however, yet, still, even so, on the other hand, or nonetheless—all of which signal contrast. In the middle of a sentence, although can sometimes be used where but or though might also work, but though or but often sound more natural. For example, "She's a great teacher, though not the most popular" is usually smoother than "She's a great teacher, although not the most popular."
(2) (meaning too rare to warrant focus)