Sense 6 (“synonym of bloodstone”) is from the fact that a piece of the mineral placed in water is said to change the sun’s rays to a blood-red colour: see the 1601 quotation.[1]
In the Opale, there be obſerved alſo divers blemiſhes and imperfections as vvell as in other ſtones; namely, if the colour reſemble the floure of that hearbe vvhich is called Heliotropium, id eſt, Turneſole:[…]]
Lac[o]. Theſe forked tricks, I vnderſtand 'hem not. / VVould he vvould tell vs vvhome he loues, or hates, / That vve might follovv, vvithout feare, or doubt. / Arr[untius]. Good Heliotrope! Is this your honeſt man? / Let him be yours ſo ſtill. He is my knaue.
Referring to a faithful follower.
[1604 March 25 (first performance; Gregorian calendar; published 1604), Beniamin Ionson [i.e., Ben Jonson], “Part of the Kings Entertainment in Passing to His Coronation [The Coronation Triumph]”, in The Workes of Beniamin Ionson (First Folio), London: […]Will[iam] Stansby, published 1616, →OCLC, pages 846–847:
AGRYPNIA, or Vigilance, […] her chaplet of Heliotropium, or turneſole; in her one hand a lampe, or creſſet, in her other a bell. The lampe ſignified ſearch and ſight, the bell vvarning. The Heliotropium care; and reſpecting her obiect.]
a.1627 (date written), Francis Bacon, “[Baconiana Medica.[…].] A Catalogue of Astringents, Openers, and Cordials, Instrumental to Health.[…]”, in [Thomas Tenison], editor, Baconiana. Or Certain Genuine Remains of Sr. Francis Bacon,[…], London: […] J. D. for Richard Chiswell,[…], published 1679, →OCLC, page 166:
[S]till as on the night before, slouched Ahab stood fixed within his scuttle; his hid, heliotrope glance anticipatingly gone backward on its dial; sat due eastward for the earliest sun.
As they entered now, it seemed a blaze of roses and carnations, though one recognised in a moment the presence of the lily, the heliotrope, and the stock.
Ransacking the drawers of the dresser he came upon a discarded, tiny, ragged handkerchief. He pressed it to his face. It was racy and insolent with heliotrope; he hurled it to the floor.
Kit woke to see looming over him the face of Dr. Willi Dingkopf, framed by a haircut in violation of more than one law of physics, and a vivid necktie in fuchsia, heliotrope, and duck green, a gift from one of the patients, […]
The pretious ſtone Heliotropium, is found in Æthiopia, Affricke, and Cyprus: the ground thereof is a deepe greene in manner of a leeke, but the ſame is garniſhed vvith veins of bloud: the reaſon of the name Heliotropium is this, For that if it be throvvne into a paile of vvater, it chaungeth the raies of the Sun by vvay of reverberation into a bloudie colour, eſpecially that vvhich commeth out of Æthiopia: the ſame beeing vvithout the vvater, doth repreſent the bodie of the Sun, like unto a mirroir:[…]]
Amid this dread exuberance of woe / Ran naked spirits wing'd with horrid fear, / Nor hope had they of crevice where to hide, / Or heliotrope to charm them out of view.
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1904, Jerome K[lapka] Jerome, “Story the Sixth: ‘The Babe’ Applies for Shares”, in Tommy and Co., 1st Canadian edition, Toronto, Ont.: Langton and Hall, →OCLC, page 232:
"Lady in a heliotrope dress with a lace collar, three flounces on the skirt?" / "That's right, Mr. Bennett," agreed old Goslin. / "It's the Babe himself!" asserted Harry Bennett.
There was a ten-mile stretch of level ground, blown hard as rock, from which the sustenance had been bleached, for not a spear of grass grew there. And following that was a tortuous passage through a weird region of clay dunes, blue and violet and heliotrope and lavender, all worn smooth by rain and wind.