I used to buy a lot of Peet's Masala Chai tea in the US. If it helps, the ingredients listed on the tea box are:
1. Broken Orange Pekoe tea from India, but other black teas may do as well
2. cinnamon = canela
3. ginger = gengibre
4. cardamom = cardamomo
5. cloves = clavos de olor
6. pepper = pimienta
The recipe below pretty much replicates this, but actually require boiling the spices, which extracts more of their essence, rather than just steeping a tea bag - which is of course easier!!
Chai Spice Blend :
2 Tablespoons ground cinnamon
2 Tablespoons ground cardamom
2 Tablespoons dried ginger root
2 Tablespoons dried orange peel
2 Tablespoons dried astragalus root, broken into small pieces
1 Tablespoon whole black peppercorns
1 Tablespoon whole cloves
NB: Ginger root and orange peel can also be used fresh.