All 6 Uses

although
in
The Adventures of Tom Sawyer
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Although my book is intended mainly for the entertainment of boys and girls, I hope it will not be shunned by men and women on that account, for part of my plan has been to try to pleasantly remind adults of what they once were themselves, and of how they felt and thought and talked, and what queer enterprises they sometimes engaged in.†
Chpt 1

although = even though -- used to connect contrasting ideas
And he remembered that although the pump was only a hundred and fifty yards off, Jim never got back with a bucket of water under an hour—and even then somebody generally had to go after him.†
Chpt 2 *
But although Tom's ear tingled, his heart was jubilant.†
Chpt 6
He was such a comfort to me, although he tormented my old heart out of me, 'most.†
Chpt 15
An unusual quiet possessed the village, although it was ordinarily quiet enough, in all conscience.†
Chpt 17
Mr. Dobbins' lashings were very vigorous ones, too; for although he carried, under his wig, a perfectly bald and shiny head, he had only reached middle age, and there was no sign of feebleness in his muscle.†
Chpt 21

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)