Learn Turkish: Bu beyazımsı taşın saydam bir görünümü var. - This whitish stone has a transparent appearance.

The suffix -(I)msI adds the meaning of '-ish' or 'similar to' to adjectives and nouns. Since beyaz ends in a consonant, we use the four-way vowel harmony version starting with a vowel: -ımsı. If the root ended in a vowel, like sarı, it would just take -msı to become sarımsı.

Why is the sentence structured as taşın ... görünümü var to mean 'the stone has'?

In Turkish, the most common way to say 'X has Y' is by using the genitive-possessive structure with var, literally translating to 'X's Y exists.' Here, taşın is the genitive (stone's) and görünümü is the possessive (its appearance).

Where does the word görünümü come from?

It stems from the verb görmek (to see). Adding the reflexive or passive suffix gives görünmek (to appear or be seen), which then becomes the noun görünüm (appearance). The final -ü in this sentence is the third-person possessive suffix linking it back to the stone.

Why does bir come after the adjective saydam instead of before it?