Brown-Driver-Briggs
 תְּכֵ֫לֶת48  noun feminine violet, i.e. 
violet thread and stuff; 
ᵐ5 usually 
υἄκινθος, 
υἀκίθινος; see Thatcher
Hast. DB COLOURS (Late Hebrew = Biblical Hebrew; 
ᵑ7 תִּכְלָא); — 
1 violet thread (spun, Exodus 35:25; woven, Exodus 39:3): 
a. in Exodus (P) of hangings of tabernacle, ephod, etc., ׳ת + אַרְגָּמָן, תּוֺלַעַת שָׁנִי (q. v.; often also שֵׁשׁ, זהב), Exodus 25:4; Exodus 26:1; Exodus 28:5,6,33; Exodus 35:25 20t.; of temple hangings (+ אַרְגָּמָן, אַרְגְּוָן, כַּרְמִיל, בּוּץ) 2 Chron 2:6; 2 Chronicles 2:13; 2 Chronicles 2:14; loops or cords of ׳ת (alone) Exodus 26:4; Exodus 28:28,31,37; Exodus 36:11; Exodus 39:21,22,31; Numbers 15:38 (all P). 
b. palace hangings in Shushan + חוּר Esther 1:6. 
2 violet stuff, fabric.; ׳לְבוּשֵׁי ת Ezekiel 23:6, ׳גְּלוֺמֵי ת וְרִקְמָה Ezekiel 27:24; וְאַרְגָּמָן לְבוּשָׁם ׳ת Jeremiah 10:9; also in trade Ezekiel 27:7 (+ אַרְגָּמָן, שֵׁשׁ בְּרִקְמָה), compare ׳בֶּגֶד ת for covering sacred utensils Numbers 4:6,7,9,11,12 (P).