Primary, Secondary runes on the store page?

Solution 1:

Unfortunately, the only in-game way to determine numerical ranking is by comparing the values of the mark/seal/glyph directly (A secondary stat will be lower for an equivalent tier rune when compared to a primary stat).

It sucks, but it is what it is.

Fortunately, fanmade data exists which can alleviate this unfortunate design oversight. For this, I point you directly at this page on the League of Legends Wiki.

Primary Mark:

• Alacrity (Attack Speed)
• Desolation (Armor Penetration)
• Furor (Critical Damage)
• Insight (Magic Penetration)
• Malice (Critical Chance)
• Might (Attack Damage per level)
• Strength (Attack Damage)

Primary Seal: -

• Clarity (Mana Regen / 5 sec per level)
• Defense (Armor per level)
• Evasion (Dodge)
• Fortitude (Health)
• Lucidity (Energy Regen / 5 sec per level)
• Meditation (Energy Regen / 5 sec)
• Regeneration (Health Regen / 5 sec per level)
• Replenishment (Mana Regen / 5 sec)
• Resilience (Armor)
• Vigor (Health Regen / 5 sec)
• Vitality (Health per level)

Primary Glyph: -

• Acumen (Energy)
• Celerity (Cooldown per level)
• Focus (Cooldown)
• Force (Ability Power per level)
• Intellect (Mana)
• Knowledge (Mana per level)
• Potency (Ability Power)
• Sapience (Energy per level)
• Shielding (Magic Resist per level)
• Warding (Magic Resist)