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The 7 capital sins, which give rise to other sins, can be mortal:
10. Unbelief in General
   11. Heresy
   12. Apostasy
   13. Sin of Blasphemy, in General
   14. Blasphemy Against the Holy Ghost
   15. Vices Opposed to Knowledge and Understanding
        1. blindness of mind
        2. dullness of sense
   20. Despair
   21. Presumption
   34. Hatred
   35. Sloth
   36. Envy
   37. Discord, Which Is Contrary to Peace
   38. Contention
   39. Schism
   40. War
   41. Strife
   42. Sedition
   43. Scandal
   46. Folly Which Is Opposed to Wisdom
Treatise on Prudence and Justice
53. Imprudence
   54. Negligence
   55. Vices Opposed to Prudence by Way of Resemblance
        1. prudence of the flesh
        3. craftiness
        4. guile
        5. fraud
        6. solicitude about temporal things
        7. solicitude about the future
   59. Injustice
   63. Respect of Persons
   64. Murder
   65. Injuries Committed on the Person
        1. mutilation of members
        2. blows
        3. imprisonment
   66. Theft and Robbery
   67. Injustice of a Judge, in Judging
   68. Matters Concerning Unjust Accusation
   69. Sins Committed Against Justice on the Part of the Defendant
   70. Injustice with Regard to the Person of the Witness
   71. Injustice in Judgment on the Part of Counsel
   72. Reviling
   73. Backbiting
   74. Tale-Bearing
   75. Derision
   76. Cursing
   77. Cheating, Which is Committed in Buying and Selling
   78. Sin of Usury
   92. Superstition
   93. Superstition Consisting in Undue Worship of the True God
   94. Idolatry
   95. Superstition in Divinations
   96. Superstition in Observances
   97. Temptation of God
   98. Perjury
   99. Sacrilege
   100. Simony
   105. Disobedience
   107. Ingratitude
   108. Vengeance
   110. Vices Opposed to Truth, and First of Lying
   111. Dissimulation and Hypocrisy
   112. Boasting
   113. Irony
   115. Flattery
   116. Quarreling
   118. Vices Opposed to Liberality, and in the First Place, of Covetousness
   119. Prodigality
Treatise on Fortitude and Temperance
125. Fear
   126. Fearlessness
   127. Daring
   130. Presumption
   131. Ambition
   132. Vainglory
   133. Pusillanimity
   135. Meanness
   138. Vices Opposed to Perseverance
        1. effeminacy
        2. pertinacity
   142. Vices Opposed to Temperance
        1. insensibility
   148. Gluttony
   150. Drunkenness
   153. Lust
   154. Parts of Lust
        2. simple fornication
        6. seduction
        7. rape
        8. adultery
        9. incest
        10. sacrilege (in the sense of violating a person consecrated to God such as a priest, brother, or nun)
        11. unnatural vice (sodomy, masturbation, be*t**lity, etc.)
   156. Incontinence
   158. Anger
   159. Cruelty
   162. Pride
   163. First Man's Sin
   167. Curiosity